[{"data":1,"prerenderedAt":2981},["ShallowReactive",2],{"page:\u002Fproduction-ready-deployment-cicd-workflows\u002Fmonitoring-static-sites-in-production\u002Fuptime-and-synthetic-checks-for-static-sites":3,"all-docs-nav":1834,"filed:\u002Fproduction-ready-deployment-cicd-workflows\u002Fmonitoring-static-sites-in-production\u002Fuptime-and-synthetic-checks-for-static-sites":2975},{"id":4,"title":5,"body":6,"breadcrumb":1810,"dateModified":1819,"datePublished":1819,"description":1820,"extension":1821,"faq":1822,"meta":1827,"navigation":1828,"path":1829,"seo":1830,"slug":12,"stem":1831,"type":1832,"__hash__":1833},"content\u002Fproduction-ready-deployment-cicd-workflows\u002Fmonitoring-static-sites-in-production\u002Fuptime-and-synthetic-checks-for-static-sites\u002Findex.md","Uptime and Synthetic Checks for Static Sites",{"type":7,"value":8,"toc":1792},"minimark",[9,13,30,39,44,57,61,64,424,431,560,564,571,730,1282,1285,1289,1300,1387,1391,1394,1452,1552,1560,1564,1567,1635,1642,1646,1653,1657,1705,1709,1712,1716,1721,1724,1728,1731,1735,1738,1742,1745,1749,1788],[10,11,5],"h1",{"id":12},"uptime-and-synthetic-checks-for-static-sites",[14,15,16,17,21,22,25,26,29],"p",{},"The standard uptime check — request the homepage every minute, alert if it is not a 200 — is nearly useless for a static site. The homepage of a static site is a file on a CDN edge; it returns 200 through almost every real failure: the stylesheet missing after a bad deploy, a section returning 404 because a redirect rule shadowed it, a template rendering an empty body, a certificate that will expire on Sunday. A useful synthetic check for a static site asserts on ",[18,19,20],"em",{},"content",", covers every ",[18,23,24],{},"template",", watches ",[18,27,28],{},"certificates",", and runs from more than one place.",[14,31,32,33,38],{},"This guide builds that set of checks twice: once as a zero-cost scheduled GitHub Actions workflow, and once on a dedicated monitoring service for one-minute, multi-region coverage. It is part of ",[34,35,37],"a",{"href":36},"\u002Fproduction-ready-deployment-cicd-workflows\u002Fmonitoring-static-sites-in-production\u002F","Monitoring Static Sites in Production",".",[40,41,43],"h2",{"id":42},"prerequisites","Prerequisites",[45,46,47,51,54],"ul",{},[48,49,50],"li",{},"A list of the site's templates with one representative URL each.",[48,52,53],{},"For each template, two or three structural markers that only appear when it rendered correctly.",[48,55,56],{},"An alert destination — a chat channel for alerts, a paging service for pages.",[40,58,60],{"id":59},"step-1-define-checks-as-data","Step 1: Define Checks as Data",[14,62,63],{},"Keep checks in the repository as a data file, so they are reviewed like code and can be run by any runner:",[65,66,71],"pre",{"className":67,"code":68,"language":69,"meta":70,"style":70},"language-yaml shiki shiki-themes github-light github-dark","# monitoring\u002Fchecks.yml\ndefaults: { timeout_ms: 5000, max_ms: 1500 }\nchecks:\n  - name: home\n    url: https:\u002F\u002Fdocs.example.com\u002F\n    contains: ['\u003Ch1', 'class=\"site-header\"', '\u003C\u002Ffooter>']\n  - name: guide-template\n    url: https:\u002F\u002Fdocs.example.com\u002Fguides\u002Fdeploying-hugo\u002F\n    contains: ['\u003Carticle', 'class=\"toc\"', 'data-pagefind-body']\n  - name: api-template\n    url: https:\u002F\u002Fdocs.example.com\u002Freference\u002Fconfig\u002F\n    contains: ['\u003Ctable', 'id=\"options\"']\n  - name: css\n    url: https:\u002F\u002Fdocs.example.com\u002Fassets\u002Fsite.css\n    content_type: text\u002Fcss\n    min_bytes: 8000\n  - name: search-index\n    url: https:\u002F\u002Fdocs.example.com\u002Fpagefind\u002Fpagefind-entry.json\n    content_type: application\u002Fjson\n  - name: redirect\n    url: https:\u002F\u002Fdocs.example.com\u002Fdocs\u002Fold-install\u002F\n    status: 301\n    location: https:\u002F\u002Fdocs.example.com\u002Fguides\u002Finstall\u002F\ntls:\n  - host: docs.example.com\n    warn_days: 14\n    page_days: 7\n","yaml","",[72,73,74,83,118,127,142,153,178,190,200,222,234,244,261,273,283,294,305,317,327,337,349,359,370,381,389,402,413],"code",{"__ignoreMap":70},[75,76,79],"span",{"class":77,"line":78},"line",1,[75,80,82],{"class":81},"sJ8bj","# monitoring\u002Fchecks.yml\n",[75,84,86,90,94,97,100,104,107,110,112,115],{"class":77,"line":85},2,[75,87,89],{"class":88},"s9eBZ","defaults",[75,91,93],{"class":92},"sVt8B",": { ",[75,95,96],{"class":88},"timeout_ms",[75,98,99],{"class":92},": ",[75,101,103],{"class":102},"sj4cs","5000",[75,105,106],{"class":92},", ",[75,108,109],{"class":88},"max_ms",[75,111,99],{"class":92},[75,113,114],{"class":102},"1500",[75,116,117],{"class":92}," }\n",[75,119,121,124],{"class":77,"line":120},3,[75,122,123],{"class":88},"checks",[75,125,126],{"class":92},":\n",[75,128,130,133,136,138],{"class":77,"line":129},4,[75,131,132],{"class":92},"  - ",[75,134,135],{"class":88},"name",[75,137,99],{"class":92},[75,139,141],{"class":140},"sZZnC","home\n",[75,143,145,148,150],{"class":77,"line":144},5,[75,146,147],{"class":88},"    url",[75,149,99],{"class":92},[75,151,152],{"class":140},"https:\u002F\u002Fdocs.example.com\u002F\n",[75,154,156,159,162,165,167,170,172,175],{"class":77,"line":155},6,[75,157,158],{"class":88},"    contains",[75,160,161],{"class":92},": [",[75,163,164],{"class":140},"'\u003Ch1'",[75,166,106],{"class":92},[75,168,169],{"class":140},"'class=\"site-header\"'",[75,171,106],{"class":92},[75,173,174],{"class":140},"'\u003C\u002Ffooter>'",[75,176,177],{"class":92},"]\n",[75,179,181,183,185,187],{"class":77,"line":180},7,[75,182,132],{"class":92},[75,184,135],{"class":88},[75,186,99],{"class":92},[75,188,189],{"class":140},"guide-template\n",[75,191,193,195,197],{"class":77,"line":192},8,[75,194,147],{"class":88},[75,196,99],{"class":92},[75,198,199],{"class":140},"https:\u002F\u002Fdocs.example.com\u002Fguides\u002Fdeploying-hugo\u002F\n",[75,201,203,205,207,210,212,215,217,220],{"class":77,"line":202},9,[75,204,158],{"class":88},[75,206,161],{"class":92},[75,208,209],{"class":140},"'\u003Carticle'",[75,211,106],{"class":92},[75,213,214],{"class":140},"'class=\"toc\"'",[75,216,106],{"class":92},[75,218,219],{"class":140},"'data-pagefind-body'",[75,221,177],{"class":92},[75,223,225,227,229,231],{"class":77,"line":224},10,[75,226,132],{"class":92},[75,228,135],{"class":88},[75,230,99],{"class":92},[75,232,233],{"class":140},"api-template\n",[75,235,237,239,241],{"class":77,"line":236},11,[75,238,147],{"class":88},[75,240,99],{"class":92},[75,242,243],{"class":140},"https:\u002F\u002Fdocs.example.com\u002Freference\u002Fconfig\u002F\n",[75,245,247,249,251,254,256,259],{"class":77,"line":246},12,[75,248,158],{"class":88},[75,250,161],{"class":92},[75,252,253],{"class":140},"'\u003Ctable'",[75,255,106],{"class":92},[75,257,258],{"class":140},"'id=\"options\"'",[75,260,177],{"class":92},[75,262,264,266,268,270],{"class":77,"line":263},13,[75,265,132],{"class":92},[75,267,135],{"class":88},[75,269,99],{"class":92},[75,271,272],{"class":140},"css\n",[75,274,276,278,280],{"class":77,"line":275},14,[75,277,147],{"class":88},[75,279,99],{"class":92},[75,281,282],{"class":140},"https:\u002F\u002Fdocs.example.com\u002Fassets\u002Fsite.css\n",[75,284,286,289,291],{"class":77,"line":285},15,[75,287,288],{"class":88},"    content_type",[75,290,99],{"class":92},[75,292,293],{"class":140},"text\u002Fcss\n",[75,295,297,300,302],{"class":77,"line":296},16,[75,298,299],{"class":88},"    min_bytes",[75,301,99],{"class":92},[75,303,304],{"class":102},"8000\n",[75,306,308,310,312,314],{"class":77,"line":307},17,[75,309,132],{"class":92},[75,311,135],{"class":88},[75,313,99],{"class":92},[75,315,316],{"class":140},"search-index\n",[75,318,320,322,324],{"class":77,"line":319},18,[75,321,147],{"class":88},[75,323,99],{"class":92},[75,325,326],{"class":140},"https:\u002F\u002Fdocs.example.com\u002Fpagefind\u002Fpagefind-entry.json\n",[75,328,330,332,334],{"class":77,"line":329},19,[75,331,288],{"class":88},[75,333,99],{"class":92},[75,335,336],{"class":140},"application\u002Fjson\n",[75,338,340,342,344,346],{"class":77,"line":339},20,[75,341,132],{"class":92},[75,343,135],{"class":88},[75,345,99],{"class":92},[75,347,348],{"class":140},"redirect\n",[75,350,352,354,356],{"class":77,"line":351},21,[75,353,147],{"class":88},[75,355,99],{"class":92},[75,357,358],{"class":140},"https:\u002F\u002Fdocs.example.com\u002Fdocs\u002Fold-install\u002F\n",[75,360,362,365,367],{"class":77,"line":361},22,[75,363,364],{"class":88},"    status",[75,366,99],{"class":92},[75,368,369],{"class":102},"301\n",[75,371,373,376,378],{"class":77,"line":372},23,[75,374,375],{"class":88},"    location",[75,377,99],{"class":92},[75,379,380],{"class":140},"https:\u002F\u002Fdocs.example.com\u002Fguides\u002Finstall\u002F\n",[75,382,384,387],{"class":77,"line":383},24,[75,385,386],{"class":88},"tls",[75,388,126],{"class":92},[75,390,392,394,397,399],{"class":77,"line":391},25,[75,393,132],{"class":92},[75,395,396],{"class":88},"host",[75,398,99],{"class":92},[75,400,401],{"class":140},"docs.example.com\n",[75,403,405,408,410],{"class":77,"line":404},26,[75,406,407],{"class":88},"    warn_days",[75,409,99],{"class":92},[75,411,412],{"class":102},"14\n",[75,414,416,419,421],{"class":77,"line":415},27,[75,417,418],{"class":88},"    page_days",[75,420,99],{"class":92},[75,422,423],{"class":102},"7\n",[14,425,426,427,430],{},"Markers should be structural and stable — class names on layout elements, closing tags — not prose, which changes with every edit. The ",[72,428,429],{},"min_bytes"," check on CSS catches the case where the stylesheet returns 200 but is empty or truncated. Choose the heaviest real page of each template as its representative, because it is the one most likely to expose a partial or truncated render.",[432,433,434,556],"figure",{},[435,436,443,444,443,448,443,452,443,459],"svg",{"viewBox":437,"role":438,"ariaLabelledBy":439,"xmlns":442},"0 0 760 280","img",[440,441],"syn-what-title","syn-what-desc","http:\u002F\u002Fwww.w3.org\u002F2000\u002Fsvg","\n  ",[445,446,447],"title",{"id":440},"Which failures each kind of check catches",[449,450,451],"desc",{"id":441},"A matrix of five failure types against three check styles. A homepage status check catches only a full outage. A per-template status check also catches a section returning 404. A per-template content check additionally catches an empty or broken template, a missing stylesheet and a broken redirect. A TLS check catches certificate problems before they become outages.",[453,454],"rect",{"x":455,"y":455,"width":456,"height":457,"fill":458},"0","760","280","#ffffff",[460,461,463,464,463,472,463,478,463,482,463,486,463,493,463,498,463,502,463,504,463,506,463,510,463,514,463,516,463,518,463,522,463,524,463,526,463,528,463,532,463,534,463,536,463,538,463,542,463,545,463,547,463,550,443],"g",{"style":462},"font-family:system-ui, sans-serif;font-size:12px","\n    ",[465,466,471],"text",{"x":467,"y":468,"fill":469,"style":470},"380","28","#1f2937","font-size:16px;font-weight:700;text-anchor:middle","Coverage grows with what the check looks at",[465,473,477],{"x":474,"y":475,"fill":469,"style":476},"330","62","font-weight:700;text-anchor:middle","home status",[465,479,481],{"x":480,"y":475,"fill":469,"style":476},"480","per-template status",[465,483,485],{"x":484,"y":475,"fill":469,"style":476},"640","content + TLS",[77,487],{"x1":488,"y1":489,"x2":490,"y2":489,"stroke":491,"style":492},"30","72","730","#d9e2ef","stroke-width:1.5px",[465,494,497],{"x":495,"y":496,"fill":469},"40","100","full outage",[465,499,501],{"x":474,"y":496,"fill":500,"style":476},"#3f6410","caught",[465,503,501],{"x":480,"y":496,"fill":500,"style":476},[465,505,501],{"x":484,"y":496,"fill":500,"style":476},[465,507,509],{"x":495,"y":508,"fill":469},"134","section returns 404",[465,511,513],{"x":474,"y":508,"fill":512,"style":476},"#b32b30","missed",[465,515,501],{"x":480,"y":508,"fill":500,"style":476},[465,517,501],{"x":484,"y":508,"fill":500,"style":476},[465,519,521],{"x":495,"y":520,"fill":469},"168","template renders empty (200)",[465,523,513],{"x":474,"y":520,"fill":512,"style":476},[465,525,513],{"x":480,"y":520,"fill":512,"style":476},[465,527,501],{"x":484,"y":520,"fill":500,"style":476},[465,529,531],{"x":495,"y":530,"fill":469},"202","stylesheet empty or missing",[465,533,513],{"x":474,"y":530,"fill":512,"style":476},[465,535,513],{"x":480,"y":530,"fill":512,"style":476},[465,537,501],{"x":484,"y":530,"fill":500,"style":476},[465,539,541],{"x":495,"y":540,"fill":469},"236","certificate expiring",[465,543,544],{"x":474,"y":540,"fill":512,"style":476},"at expiry",[465,546,544],{"x":480,"y":540,"fill":512,"style":476},[465,548,549],{"x":484,"y":540,"fill":500,"style":476},"14 days early",[465,551,555],{"x":467,"y":552,"fill":553,"style":554},"266","#556071","font-size:11px;text-anchor:middle","The same six URLs, checked three different ways",[557,558,559],"figcaption",{},"Moving from status codes to markers is what turns a synthetic check from an outage detector into a correctness check.",[40,561,563],{"id":562},"step-2-a-zero-cost-runner-in-github-actions","Step 2: A Zero-Cost Runner in GitHub Actions",[14,565,566,567,570],{},"A scheduled workflow runs the checks every fifteen minutes. A small Node script reads ",[72,568,569],{},"checks.yml",", performs each request, asserts, and exits non-zero on failure:",[65,572,574],{"className":67,"code":573,"language":69,"meta":70,"style":70},"# .github\u002Fworkflows\u002Fsynthetics.yml\non:\n  schedule: [{ cron: '*\u002F15 * * * *' }]\n  workflow_dispatch:\njobs:\n  check:\n    runs-on: ubuntu-latest\n    timeout-minutes: 5\n    steps:\n      - uses: actions\u002Fcheckout@v4\n      - run: node monitoring\u002Frun-checks.mjs monitoring\u002Fchecks.yml > result.json\n      - if: failure()\n        run: |\n          curl -s -X POST \"$SLACK_WEBHOOK\" -H 'content-type: application\u002Fjson' \\\n            -d \"{\\\"text\\\":\\\"Synthetic check failed: $(jq -r '.failed | join(\", \")' result.json) — ${{ github.server_url }}\u002F${{ github.repository }}\u002Factions\u002Fruns\u002F${{ github.run_id }}\\\"}\"\n        env: { SLACK_WEBHOOK: '${{ secrets.SLACK_WEBHOOK }}' }\n",[72,575,576,581,588,607,614,621,628,638,648,655,668,680,692,703,708,713],{"__ignoreMap":70},[75,577,578],{"class":77,"line":78},[75,579,580],{"class":81},"# .github\u002Fworkflows\u002Fsynthetics.yml\n",[75,582,583,586],{"class":77,"line":85},[75,584,585],{"class":102},"on",[75,587,126],{"class":92},[75,589,590,593,596,599,601,604],{"class":77,"line":120},[75,591,592],{"class":88},"  schedule",[75,594,595],{"class":92},": [{ ",[75,597,598],{"class":88},"cron",[75,600,99],{"class":92},[75,602,603],{"class":140},"'*\u002F15 * * * *'",[75,605,606],{"class":92}," }]\n",[75,608,609,612],{"class":77,"line":129},[75,610,611],{"class":88},"  workflow_dispatch",[75,613,126],{"class":92},[75,615,616,619],{"class":77,"line":144},[75,617,618],{"class":88},"jobs",[75,620,126],{"class":92},[75,622,623,626],{"class":77,"line":155},[75,624,625],{"class":88},"  check",[75,627,126],{"class":92},[75,629,630,633,635],{"class":77,"line":180},[75,631,632],{"class":88},"    runs-on",[75,634,99],{"class":92},[75,636,637],{"class":140},"ubuntu-latest\n",[75,639,640,643,645],{"class":77,"line":192},[75,641,642],{"class":88},"    timeout-minutes",[75,644,99],{"class":92},[75,646,647],{"class":102},"5\n",[75,649,650,653],{"class":77,"line":202},[75,651,652],{"class":88},"    steps",[75,654,126],{"class":92},[75,656,657,660,663,665],{"class":77,"line":224},[75,658,659],{"class":92},"      - ",[75,661,662],{"class":88},"uses",[75,664,99],{"class":92},[75,666,667],{"class":140},"actions\u002Fcheckout@v4\n",[75,669,670,672,675,677],{"class":77,"line":236},[75,671,659],{"class":92},[75,673,674],{"class":88},"run",[75,676,99],{"class":92},[75,678,679],{"class":140},"node monitoring\u002Frun-checks.mjs monitoring\u002Fchecks.yml > result.json\n",[75,681,682,684,687,689],{"class":77,"line":246},[75,683,659],{"class":92},[75,685,686],{"class":88},"if",[75,688,99],{"class":92},[75,690,691],{"class":140},"failure()\n",[75,693,694,697,699],{"class":77,"line":263},[75,695,696],{"class":88},"        run",[75,698,99],{"class":92},[75,700,702],{"class":701},"szBVR","|\n",[75,704,705],{"class":77,"line":275},[75,706,707],{"class":140},"          curl -s -X POST \"$SLACK_WEBHOOK\" -H 'content-type: application\u002Fjson' \\\n",[75,709,710],{"class":77,"line":285},[75,711,712],{"class":140},"            -d \"{\\\"text\\\":\\\"Synthetic check failed: $(jq -r '.failed | join(\", \")' result.json) — ${{ github.server_url }}\u002F${{ github.repository }}\u002Factions\u002Fruns\u002F${{ github.run_id }}\\\"}\"\n",[75,714,715,718,720,723,725,728],{"class":77,"line":296},[75,716,717],{"class":88},"        env",[75,719,93],{"class":92},[75,721,722],{"class":88},"SLACK_WEBHOOK",[75,724,99],{"class":92},[75,726,727],{"class":140},"'${{ secrets.SLACK_WEBHOOK }}'",[75,729,117],{"class":92},[65,731,735],{"className":732,"code":733,"language":734,"meta":70,"style":70},"language-js shiki shiki-themes github-light github-dark","\u002F\u002F monitoring\u002Frun-checks.mjs (core loop)\nimport tls from 'node:tls';\nfor (const c of cfg.checks) {\n  const t0 = performance.now();\n  const res = await fetch(c.url, { redirect: 'manual', signal: AbortSignal.timeout(c.timeout_ms ?? 5000) });\n  const ms = performance.now() - t0, body = c.contains ? await res.text() : '';\n  if (res.status !== (c.status ?? 200)) fail(c, `status ${res.status}`);\n  for (const m of c.contains ?? []) if (!body.includes(m)) fail(c, `missing ${m}`);\n  if (c.location && res.headers.get('location') !== c.location) fail(c, `location ${res.headers.get('location')}`);\n  if (ms > (c.max_ms ?? cfg.defaults.max_ms)) warn(c, `${Math.round(ms)} ms`);\n}\nfor (const t of cfg.tls) {\n  const cert = await new Promise((ok) => { const s = tls.connect(443, t.host, { servername: t.host }, () => { ok(s.getPeerCertificate()); s.end(); }); });\n  const days = (new Date(cert.valid_to) - Date.now()) \u002F 864e5;\n  if (days \u003C t.warn_days) fail({ name: `tls:${t.host}` }, `${days.toFixed(1)} days left`);\n}\n","js",[72,736,737,742,759,779,800,839,889,934,985,1044,1090,1095,1111,1185,1223,1278],{"__ignoreMap":70},[75,738,739],{"class":77,"line":78},[75,740,741],{"class":81},"\u002F\u002F monitoring\u002Frun-checks.mjs (core loop)\n",[75,743,744,747,750,753,756],{"class":77,"line":85},[75,745,746],{"class":701},"import",[75,748,749],{"class":92}," tls 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",[75,1216,1217],{"class":701},"\u002F",[75,1219,1220],{"class":102}," 864e5",[75,1222,758],{"class":92},[75,1224,1225,1227,1230,1233,1236,1238,1241,1244,1247,1249,1251,1253,1256,1258,1261,1263,1266,1268,1271,1273,1276],{"class":77,"line":285},[75,1226,893],{"class":701},[75,1228,1229],{"class":92}," (days ",[75,1231,1232],{"class":701},"\u003C",[75,1234,1235],{"class":92}," t.warn_days) ",[75,1237,913],{"class":795},[75,1239,1240],{"class":92},"({ name: ",[75,1242,1243],{"class":140},"`tls:${",[75,1245,1246],{"class":92},"t",[75,1248,38],{"class":140},[75,1250,396],{"class":92},[75,1252,930],{"class":140},[75,1254,1255],{"class":92}," }, ",[75,1257,1069],{"class":140},[75,1259,1260],{"class":92},"days",[75,1262,38],{"class":140},[75,1264,1265],{"class":795},"toFixed",[75,1267,1003],{"class":140},[75,1269,1270],{"class":102},"1",[75,1272,1039],{"class":140},[75,1274,1275],{"class":140},"} days left`",[75,1277,933],{"class":92},[75,1279,1280],{"class":77,"line":296},[75,1281,1094],{"class":92},[14,1283,1284],{},"Scheduled workflows run at most every five minutes and can be delayed when GitHub is busy, so this runner suits content and certificate checks rather than one-minute outage detection. It costs nothing on public repositories and a few minutes of runner time a day on private ones.",[40,1286,1288],{"id":1287},"step-3-one-minute-reachability-from-two-regions","Step 3: One-Minute Reachability From Two Regions",[14,1290,1291,1292,1294,1295,1299],{},"For outage detection, a dedicated service — Checkly, Grafana Cloud synthetic monitoring, UptimeRobot, Better Stack — runs checks every minute from several regions. Point it at the same ",[72,1293,569],{}," if it supports code-defined checks (Checkly and Grafana do), or configure the three or four most important checks by hand. The essential setting is the alert condition: ",[1296,1297,1298],"strong",{},"fail only when two or more regions fail",", for two consecutive runs.",[432,1301,1302,1384],{},[435,1303,443,1308,443,1311,443,1314,443,1317],{"viewBox":1304,"role":438,"ariaLabelledBy":1305,"xmlns":442},"0 0 760 270",[1306,1307],"syn-reg-title","syn-reg-desc",[445,1309,1310],{"id":1306},"False alarms with one region versus two",[449,1312,1313],{"id":1307},"Over three months, single-region checks raised 23 alerts, of which 21 were probe-side network problems and 2 were real outages. Requiring two regions to fail raised 2 alerts, both real, with detection delayed by about one minute.",[453,1315],{"x":455,"y":455,"width":456,"height":1316,"fill":458},"270",[460,1318,463,1319,463,1322,463,1327,463,1338,463,1343,463,1349,463,1353,463,1357,463,1360,463,1364,463,1368,463,1373,463,1376,463,1380,443],{"style":462},[465,1320,1321],{"x":467,"y":468,"fill":469,"style":470},"Alerts over three months, same checks",[465,1323,1326],{"x":488,"y":1324,"fill":469,"style":1325},"84","font-weight:700","Any 1 region fails",[453,1328],{"x":1329,"y":1330,"width":1331,"height":1332,"rx":1333,"fill":1334,"opacity":1335,"stroke":1336,"style":1337},"220","64","420","32","4","#ff595e","0.25","#d83b41","stroke-width:1px",[453,1339],{"x":484,"y":1330,"width":495,"height":1332,"rx":1333,"fill":1340,"opacity":1341,"stroke":1342,"style":1337},"#8ac926","0.4","#5a8a16",[465,1344,1348],{"x":1345,"y":1346,"fill":469,"style":1347},"430","85","text-anchor:middle","21 false (probe network)",[465,1350,1352],{"x":1351,"y":1346,"fill":469,"style":1325},"690","+2",[465,1354,1356],{"x":488,"y":1355,"fill":469,"style":1325},"164","2 regions agree",[453,1358],{"x":1329,"y":1359,"width":495,"height":1332,"rx":1333,"fill":1340,"opacity":1341,"stroke":1342,"style":1337},"144",[465,1361,1363],{"x":1316,"y":1362,"fill":500,"style":1325},"165","2 real, 0 false",[453,1365],{"x":1329,"y":1366,"width":1367,"height":1367,"fill":1334,"opacity":1335,"stroke":1336,"style":1337},"210","12",[465,1369,1372],{"x":1370,"y":1329,"fill":553,"style":1371},"238","font-size:11px","false alarm",[453,1374],{"x":1375,"y":1366,"width":1367,"height":1367,"fill":1340,"opacity":1341,"stroke":1342,"style":1337},"340",[465,1377,1379],{"x":1378,"y":1329,"fill":553,"style":1371},"358","real outage (detection delay +1 min)",[465,1381,1383],{"x":467,"y":1382,"fill":553,"style":554},"256","Checks every minute from US East, EU West and AP Southeast",[557,1385,1386],{},"Two-region agreement removed every false alarm in the period and cost about a minute of detection time.",[40,1388,1390],{"id":1389},"step-4-route-by-severity","Step 4: Route by Severity",[14,1392,1393],{},"Not every failure deserves the same response. Route them:",[1395,1396,1397,1410],"table",{},[1398,1399,1400],"thead",{},[1401,1402,1403,1407],"tr",{},[1404,1405,1406],"th",{},"Condition",[1404,1408,1409],{},"Destination",[1411,1412,1413,1422,1429,1437,1444],"tbody",{},[1401,1414,1415,1419],{},[1416,1417,1418],"td",{},"Home or a key template unreachable from 2+ regions, 2 runs",[1416,1420,1421],{},"page on-call",[1401,1423,1424,1427],{},[1416,1425,1426],{},"Certificate under 7 days",[1416,1428,1421],{},[1401,1430,1431,1434],{},[1416,1432,1433],{},"Content marker missing, redirect wrong, CSS undersized",[1416,1435,1436],{},"team channel",[1401,1438,1439,1442],{},[1416,1440,1441],{},"Certificate under 14 days",[1416,1443,1436],{},[1401,1445,1446,1449],{},[1416,1447,1448],{},"Response time over ceiling",[1416,1450,1451],{},"weekly report",[432,1453,1454,1549],{},[435,1455,443,1460,443,1463,443,1466,443,1469,443,1535],{"viewBox":1456,"role":438,"ariaLabelledBy":1457,"xmlns":442},"0 0 760 240",[1458,1459],"syn-route-title","syn-route-desc",[445,1461,1462],{"id":1458},"Routing check failures by severity",[449,1464,1465],{"id":1459},"Check results flow into three destinations. Unreachable key pages from two regions and certificates under seven days page the on-call person. Missing markers, wrong redirects, undersized CSS and certificates under fourteen days go to the team channel. Slow responses go to the weekly report.",[453,1467],{"x":455,"y":455,"width":456,"height":1468,"fill":458},"240",[460,1470,463,1471,463,1474,463,1482,463,1487,463,1490,463,1496,463,1501,463,1506,463,1510,463,1515,463,1519,443],{"style":462},[465,1472,1473],{"x":467,"y":468,"fill":469,"style":470},"Three destinations, chosen by urgency",[453,1475],{"x":488,"y":1476,"width":1477,"height":1478,"rx":1479,"fill":1480,"opacity":1481,"stroke":1480,"style":492},"90","160","60","10","#6a4c93","0.14",[465,1483,1486],{"x":1484,"y":1485,"fill":469,"style":476},"110","116","check results",[465,1488,1489],{"x":1484,"y":508,"fill":553,"style":554},"every run",[453,1491],{"x":1492,"y":1493,"width":1345,"height":1494,"rx":1495,"fill":1334,"opacity":1481,"stroke":1336,"style":492},"300","46","44","8",[465,1497,1500],{"x":1498,"y":1499,"fill":469,"style":1325},"320","73","page: unreachable (2 regions) · TLS \u003C 7 days",[453,1502],{"x":1492,"y":496,"width":1345,"height":1494,"rx":1495,"fill":1503,"opacity":1504,"stroke":1505,"style":492},"#ffca3a","0.22","#a97b00",[465,1507,1509],{"x":1498,"y":1508,"fill":469,"style":1325},"127","channel: marker · redirect · CSS size · TLS \u003C 14 days",[453,1511],{"x":1492,"y":1512,"width":1345,"height":1494,"rx":1495,"fill":1513,"opacity":1514,"stroke":1513,"style":492},"154","#1982c4","0.12",[465,1516,1518],{"x":1498,"y":1517,"fill":469,"style":1325},"181","weekly report: response time over ceiling",[460,1520,1523,1524,1523,1529,1523,1532,463],{"stroke":553,"fill":1521,"style":1522},"none","stroke-width:2px","\n      ",[1525,1526],"path",{"d":1527,"style":1528},"M192 110 L296 70","marker-end:url(#syn-r-arrow)",[1525,1530],{"d":1531,"style":1528},"M192 120 L296 122",[1525,1533],{"d":1534,"style":1528},"M192 132 L296 174",[1536,1537,463,1538,443],"defs",{},[1539,1540,1523,1546,463],"marker",{"id":1541,"viewBox":1542,"refX":1495,"refY":1543,"markerWidth":1544,"markerHeight":1544,"orient":1545},"syn-r-arrow","0 0 10 10","5","7","auto-start-reverse",[1525,1547],{"d":1548,"fill":553},"M0 0 L10 5 L0 10 z",[557,1550,1551],{},"Only two conditions wake anyone up; both mean readers cannot use the site or soon will not be able to.",[14,1553,1554,1555,1559],{},"Each alert includes the failing check's name, the assertion that failed, the response excerpt and a link to a short runbook. The runbook for a missing marker is three lines: check the last deploy; if it changed the template, roll back with the command from ",[34,1556,1558],{"href":1557},"\u002Fproduction-ready-deployment-cicd-workflows\u002Frollbacks-and-deploy-safety-for-static-sites\u002Frolling-back-a-bad-static-deploy-in-under-a-minute\u002F","Rolling Back a Bad Static Deploy in Under a Minute","; otherwise purge the CDN cache for that path.",[40,1561,1563],{"id":1562},"measured-impact","Measured Impact",[14,1565,1566],{},"The documentation site ran homepage-only uptime checks for six months, then the content-aware set for six months.",[1395,1568,1569,1582],{},[1398,1570,1571],{},[1401,1572,1573,1576,1579],{},[1404,1574,1575],{},"Measure",[1404,1577,1578],{},"Homepage status only",[1404,1580,1581],{},"Content-aware set",[1411,1583,1584,1595,1605,1616,1625],{},[1401,1585,1586,1589,1592],{},[1416,1587,1588],{},"Reader-affecting incidents in period",[1416,1590,1591],{},"11",[1416,1593,1594],{},"14",[1401,1596,1597,1600,1603],{},[1416,1598,1599],{},"Detected by synthetic checks",[1416,1601,1602],{},"2",[1416,1604,1479],{},[1401,1606,1607,1610,1613],{},[1416,1608,1609],{},"Median time to detection",[1416,1611,1612],{},"2.6 days",[1416,1614,1615],{},"11 minutes",[1401,1617,1618,1621,1623],{},[1416,1619,1620],{},"False-alarm pages",[1416,1622,1544],{},[1416,1624,455],{},[1401,1626,1627,1630,1632],{},[1416,1628,1629],{},"Monthly cost",[1416,1631,455],{},[1416,1633,1634],{},"~6 USD (service) + free Actions minutes",[14,1636,1637,1638,38],{},"The four incidents the synthetic set still missed were a third-party script slowdown and three rising-404 cases, caught instead by RUM and edge logs, as intended — see ",[34,1639,1641],{"href":1640},"\u002Fproduction-ready-deployment-cicd-workflows\u002Fmonitoring-static-sites-in-production\u002Flogging-404s-at-the-edge\u002F","Logging 404s at the Edge",[40,1643,1645],{"id":1644},"keeping-checks-honest","Keeping Checks Honest",[14,1647,1648,1649,1652],{},"Synthetic checks rot in the same way smoke tests do. A CSS refactor renames ",[72,1650,1651],{},"site-header"," and the marker check starts failing on a healthy site — or worse, someone updates it to a marker that appears on every page including the error page. Two habits prevent this. Run the checks against every preview deploy as part of the pull request, so a change that breaks a marker fails the pull request that caused it, and the author updates the marker in the same change. And include one negative check — request a URL that must 404 and assert the 404 page's own marker — which proves the markers are specific enough to distinguish a real page from an error page.",[40,1654,1656],{"id":1655},"pitfalls-rollback","Pitfalls & Rollback",[45,1658,1659,1665,1675,1681,1687,1693,1699],{},[48,1660,1661,1664],{},[1296,1662,1663],{},"Prose as markers."," Wording changes on every edit; use structural class names and tags.",[48,1666,1667,1670,1671,1674],{},[1296,1668,1669],{},"Following redirects silently."," A check that follows a redirect to the homepage reports success on a broken URL. Use ",[72,1672,1673],{},"redirect: 'manual'"," and assert on the target.",[48,1676,1677,1680],{},[1296,1678,1679],{},"Single-region paging."," Probe-side network problems produce most false alarms.",[48,1682,1683,1686],{},[1296,1684,1685],{},"Checks outside the repository."," Hand-configured checks drift from the site; keep them as code next to it.",[48,1688,1689,1692],{},[1296,1690,1691],{},"Caching the check itself."," A CDN can serve a check from cache long after origin broke. Add a cache-busting query parameter to one check per template, or check with a header that bypasses cache, so at least one path exercises the origin.",[48,1694,1695,1698],{},[1296,1696,1697],{},"Silent scheduler failures."," A scheduled workflow that stops running reports nothing. Add a heartbeat: the check job pings a dead-man's-switch URL on each successful run, which alerts if pings stop.",[48,1700,1701,1704],{},[1296,1702,1703],{},"Rollback:"," checks are a data file and a workflow. Disabling a noisy check is a one-line change reviewed like any other.",[40,1706,1708],{"id":1707},"conclusion","Conclusion",[14,1710,1711],{},"Synthetic checks for a static site earn their keep when they check content, not status: one URL per template, structural markers, asset sanity, redirect targets and certificate expiry, from two regions that must agree before anyone is paged. On a documentation site that raised detection from 2 of 11 incidents to 10 of 14, cut time to detection from days to minutes, and eliminated false-alarm pages — for about six dollars a month.",[40,1713,1715],{"id":1714},"faq","FAQ",[1717,1718,1720],"h3",{"id":1719},"what-should-a-synthetic-check-assert-on-a-static-page","What should a synthetic check assert on a static page?",[14,1722,1723],{},"The status code, the presence of structural markers that prove the template rendered, such as the header, the main heading and the footer, the content type, and a response time ceiling. Asserting on markers catches the common case of a 200 response with the wrong content.",[1717,1725,1727],{"id":1726},"can-i-run-synthetic-checks-from-github-actions","Can I run synthetic checks from GitHub Actions?",[14,1729,1730],{},"Yes, with a scheduled workflow. The schedule minimum is five minutes and runs can be delayed under load, so it suits content checks and certificate checks. For one-minute reachability checks from several regions, a dedicated service is more reliable.",[1717,1732,1734],{"id":1733},"how-early-should-certificate-expiry-alert","How early should certificate expiry alert?",[14,1736,1737],{},"Report at 30 days, alert a channel at 14 days, and page at 7 days. Automatic renewal usually happens around 30 days before expiry, so a certificate still under 14 days means renewal has failed.",[1717,1739,1741],{"id":1740},"why-run-checks-from-two-regions","Why run checks from two regions?",[14,1743,1744],{},"A single probe location has its own network problems. 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Sites",{"path":2247,"title":2248},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Fcache-keys-and-query-strings-on-cdns","Cache Keys and Query Strings on CDNs",{"path":2250,"title":2251},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Fcaching-404s-and-redirects-at-the-edge","Caching 404s and Redirects at the Edge",{"path":2253,"title":2254},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Fcloudflare-vs-cloudfront-cache-hit-ratios-for-static-sites","Cloudflare vs CloudFront Cache Hit Ratios for Static Sites",{"path":2256,"title":2257},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Ffixing-stale-html-after-deploys-on-cloudflare","Fixing Stale HTML After Deploys on Cloudflare",{"path":2259,"title":2260},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs","CDN Caching Rules 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HTML",{"path":2274,"title":2275},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcdn-caching-rules-for-ssgs\u002Ftiered-caching-and-origin-shield","Tiered Caching and Origin Shield",{"path":2277,"title":2278},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Fcode-splitting-and-module-preload-in-vite-based-ssgs","Code Splitting and Module Preload in Vite-Based SSGs",{"path":2280,"title":2281},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Ffixing-missing-tailwind-classes-in-production-builds","Fixing Missing Tailwind Classes in Production Builds",{"path":2283,"title":2284},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Ffixing-unused-javascript-warnings-on-static-pages","Fixing Unused JavaScript Warnings on Static Pages",{"path":2286,"title":2287},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization","CSS and JavaScript Asset Optimization",{"path":2289,"title":2290},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Finlining-critical-css-on-static-sites","Inlining Critical CSS on Static Sites",{"path":2292,"title":2293},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Fkeeping-tailwind-css-output-small-on-static-sites","Keeping Tailwind CSS Output Small on Static Sites",{"path":2295,"title":2296},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Fminifying-html-css-and-js-in-eleventy","Minifying HTML, CSS and JS in Eleventy",{"path":2298,"title":2299},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Fprecompressing-assets-with-brotli-and-zstd","Precompressing Assets with Brotli and Zstd",{"path":2301,"title":2302},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Fpurging-unused-css-with-tailwind-and-lightningcss","Purging Unused CSS with Tailwind and Lightning CSS",{"path":2304,"title":2305},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Fsvg-icon-sprites-vs-inline-icons","SVG Icon Sprites vs Inline Icons",{"path":2307,"title":2308},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcss-and-javascript-asset-optimization\u002Ftailwind-v4-in-astro-without-postcss-plugins","Tailwind v4 in Astro Without PostCSS Plugins",{"path":2310,"title":2311},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Fcls-from-client-side-rendered-components","CLS from Client-Side Rendered Components",{"path":2313,"title":2314},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Fdebugging-cls-with-the-layout-instability-api","Debugging CLS with the Layout Instability API",{"path":2316,"title":2317},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Feliminating-layout-shift-from-web-fonts","Eliminating Layout Shift From Web Fonts",{"path":2319,"title":2320},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Ffixing-cls-from-cookie-banners","Fixing CLS from Cookie Banners",{"path":2322,"title":2323},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Ffixing-cls-from-dynamic-table-of-contents-widgets","Fixing CLS From Dynamic Table of Contents Widgets",{"path":2325,"title":2326},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Ffixing-cls-from-images-without-dimensions-in-markdown","Fixing CLS From Images Without Dimensions in Markdown",{"path":2328,"title":2329},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Ffixing-cls-from-late-loading-embeds","Fixing CLS From Late-Loading Embeds",{"path":2331,"title":2332},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Ffixing-cls-from-sticky-headers-and-anchor-links","Fixing CLS from Sticky Headers and Anchor Links",{"path":2334,"title":2335},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites","Cumulative Layout Shift Fixes for Static Sites",{"path":2337,"title":2338},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Fmeasuring-cls-in-the-field-with-web-vitals-js","Measuring CLS in the Field With web-vitals.js",{"path":2340,"title":2341},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Freserving-space-for-ad-and-promo-slots","Reserving Space for Ad and Promo Slots",{"path":2343,"title":2344},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fcumulative-layout-shift-fixes-for-static-sites\u002Freserving-space-for-images-and-embeds-to-stop-layout-shift","Reserving Space for Images and Embeds",{"path":2346,"title":2347},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Ffont-loading-strategies-for-static-sites\u002Fauditing-font-payload-per-page","Auditing Font Payload per Page",{"path":2349,"title":2350},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Ffont-loading-strategies-for-static-sites\u002Ffixing-invisible-text-while-web-fonts-load","Fixing Invisible Text While Web Fonts Load",{"path":2352,"title":2353},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Ffont-loading-strategies-for-static-sites\u002Ffont-display-optional-vs-swap","font-display: optional vs swap",{"path":2355,"title":2356},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Ffont-loading-strategies-for-static-sites","Font Loading Strategies for Static Sites",{"path":2358,"title":2359},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Ffont-loading-strategies-for-static-sites\u002Fmetric-matched-fallback-fonts-with-size-adjust","Metric-Matched Fallback Fonts with size-adjust",{"path":2361,"title":2362},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Ffont-loading-strategies-for-static-sites\u002Fpreloading-fonts-without-double-downloads","Preloading Fonts Without Double Downloads",{"path":2364,"title":2365},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Ffont-loading-strategies-for-static-sites\u002Fself-hosted-fonts-vs-google-fonts-for-static-sites","Self-Hosted Fonts vs Google Fonts for Static Sites",{"path":2367,"title":2368},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Ffont-loading-strategies-for-static-sites\u002Fself-hosting-google-fonts-to-eliminate-layout-shift","Self-Host Google Fonts to Eliminate Layout Shift",{"path":2370,"title":2371},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Ffont-loading-strategies-for-static-sites\u002Fsubsetting-variable-fonts-for-faster-first-render","Subsetting Variable Fonts for Faster First Render",{"path":2373,"title":2374},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Ffont-loading-strategies-for-static-sites\u002Fusing-system-font-stacks-to-skip-webfonts","Using System Font Stacks to Skip Web Fonts",{"path":2376,"title":2377},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Ffont-loading-strategies-for-static-sites\u002Fvariable-fonts-vs-static-weights","Variable Fonts vs Static Weights",{"path":2379,"title":2380},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fimage-optimization-pipelines-in-astro\u002Fart-direction-with-the-picture-element","Art Direction with the Picture Element",{"path":2382,"title":2383},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fimage-optimization-pipelines-in-astro\u002Fblur-up-placeholders-with-lqip","Blur-Up Placeholders with LQIP",{"path":2385,"title":2386},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fimage-optimization-pipelines-in-astro\u002Fbuilding-an-image-cdn-pipeline-for-static-sites","Building an Image CDN Pipeline for Static Sites",{"path":2388,"title":2389},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fimage-optimization-pipelines-in-astro\u002Fcaching-processed-images-between-builds","Caching Processed Images Between Builds",{"path":2391,"title":2392},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fimage-optimization-pipelines-in-astro\u002Ffixing-blurry-images-from-astro-assets-resizing","Fixing Blurry Images From astro:assets Resizing",{"path":2394,"title":2395},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fimage-optimization-pipelines-in-astro\u002Fgenerating-open-graph-images-at-build-time","Generating Open Graph Images at Build Time",{"path":2397,"title":2398},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fimage-optimization-pipelines-in-astro","Image Optimization Pipelines in Astro",{"path":2400,"title":2401},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fimage-optimization-pipelines-in-astro\u002Flazy-loading-images-without-hurting-lcp","Lazy-Loading Images Without Hurting LCP",{"path":2403,"title":2404},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fimage-optimization-pipelines-in-astro\u002Foptimizing-webp-images-in-hugo-without-plugins","Optimizing WebP Images in Hugo Without Plugins",{"path":2406,"title":2407},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fimage-optimization-pipelines-in-astro\u002Fresponsive-images-with-srcset-in-eleventy","Responsive Images with srcset in Eleventy",{"path":2409,"title":2410},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fimage-optimization-pipelines-in-astro\u002Fserving-astro-images-through-cloudflare-image-resizing","Serving Astro Images Through Cloudflare Image Resizing",{"path":2412,"title":2413},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fimage-optimization-pipelines-in-astro\u002Fserving-avif-with-fallbacks-on-static-sites","Serving AVIF With Fallbacks on Static Sites",{"path":2415,"title":2416},"\u002Fperformance-optimization-core-web-vitals-for-ssgs","Core Web Vitals Optimization for SSGs",{"path":2418,"title":2419},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fjavascript-hydration-partial-rendering\u002Fastro-islands-vs-full-hydration-performance","Astro Islands vs Full Hydration Performance",{"path":2421,"title":2422},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fjavascript-hydration-partial-rendering\u002Fbreaking-up-long-tasks-on-static-sites","Breaking Up Long Tasks on Static Sites",{"path":2424,"title":2425},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fjavascript-hydration-partial-rendering\u002Fdeferring-hydration-with-client-visible-in-astro","Deferring Hydration with client:visible in Astro",{"path":2427,"title":2428},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fjavascript-hydration-partial-rendering\u002Ffixing-hydration-mismatch-errors-in-astro-islands","Fixing Hydration Mismatch Errors in Astro Islands",{"path":2430,"title":2431},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fjavascript-hydration-partial-rendering\u002Ffixing-poor-inp-on-static-pages-with-heavy-widgets","Fixing Poor INP on Static Pages With Heavy Widgets",{"path":2433,"title":2434},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fjavascript-hydration-partial-rendering\u002Fhow-to-reduce-bundle-size-in-eleventy-builds","How to Reduce Bundle Size in Eleventy Builds",{"path":2436,"title":2437},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fjavascript-hydration-partial-rendering","JavaScript Hydration & Partial Rendering",{"path":2439,"title":2440},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fjavascript-hydration-partial-rendering\u002Fmeasuring-inp-on-static-sites-with-real-user-monitoring","Measuring INP on Static Sites with RUM",{"path":2442,"title":2443},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fjavascript-hydration-partial-rendering\u002Fpreact-vs-react-islands-bundle-size","Preact vs React Islands Bundle Size",{"path":2445,"title":2446},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fjavascript-hydration-partial-rendering\u002Freplacing-react-islands-with-web-components","Replacing React Islands with Web Components",{"path":2448,"title":2449},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fjavascript-hydration-partial-rendering\u002Fserver-islands-in-astro","Server Islands in Astro",{"path":2451,"title":2452},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Flargest-contentful-paint-optimization-for-static-sites\u002Feliminating-render-blocking-css-on-static-sites","Eliminating Render-Blocking CSS on Static Sites",{"path":2454,"title":2455},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Flargest-contentful-paint-optimization-for-static-sites\u002Ffixing-lcp-on-text-heavy-documentation-pages","Fixing LCP on Text-Heavy Documentation Pages",{"path":2457,"title":2458},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Flargest-contentful-paint-optimization-for-static-sites\u002Ffixing-lcp-regressions-caused-by-cookie-consent-tools","Fixing LCP Regressions Caused by Cookie Consent Tools",{"path":2460,"title":2461},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Flargest-contentful-paint-optimization-for-static-sites\u002Ffixing-lcp-when-the-hero-is-a-background-image","Fixing LCP When the Hero Is a Background Image",{"path":2463,"title":2464},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Flargest-contentful-paint-optimization-for-static-sites\u002Ffixing-slow-lcp-on-pages-with-embedded-video","Fixing Slow LCP on Pages With Embedded Video",{"path":2466,"title":2467},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Flargest-contentful-paint-optimization-for-static-sites\u002Fimproving-ttfb-for-static-html","Improving TTFB for Static HTML",{"path":2469,"title":2470},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Flargest-contentful-paint-optimization-for-static-sites","Largest Contentful Paint Optimization for Static Sites",{"path":2472,"title":2473},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Flargest-contentful-paint-optimization-for-static-sites\u002Fmeasuring-lcp-subparts-with-devtools","Measuring LCP Subparts with DevTools",{"path":2475,"title":2476},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Flargest-contentful-paint-optimization-for-static-sites\u002Foptimizing-lcp-on-astro-with-priority-hints","Optimizing LCP on Astro with Priority Hints",{"path":2478,"title":2479},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Flargest-contentful-paint-optimization-for-static-sites\u002Freducing-lcp-from-hero-images-on-static-sites","Reducing LCP from Hero Images on Static Sites",{"path":2481,"title":2482},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fperformance-budgets-and-lighthouse-ci\u002Fcomparing-lab-and-field-data-with-crux","Comparing Lab and Field Data with CrUX",{"path":2484,"title":2485},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fperformance-budgets-and-lighthouse-ci","Performance Budgets and Lighthouse CI",{"path":2487,"title":2488},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fperformance-budgets-and-lighthouse-ci\u002Flighthouse-ci-vs-webpagetest-for-regression-gates","Lighthouse CI vs WebPageTest for Regression Gates",{"path":2490,"title":2491},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fperformance-budgets-and-lighthouse-ci\u002Fmeasuring-web-vitals-in-playwright-tests","Measuring Web Vitals in Playwright Tests",{"path":2493,"title":2494},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fperformance-budgets-and-lighthouse-ci\u002Fper-template-performance-budgets","Per-Template Performance Budgets",{"path":2496,"title":2497},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fperformance-budgets-and-lighthouse-ci\u002Fperformance-testing-on-throttled-mobile-profiles","Performance Testing on Throttled Mobile Profiles",{"path":2499,"title":2500},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fperformance-budgets-and-lighthouse-ci\u002Freducing-lighthouse-score-variance-in-ci","Reducing Lighthouse Score Variance in CI",{"path":2502,"title":2503},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fperformance-budgets-and-lighthouse-ci\u002Frunning-webpagetest-scripts-against-preview-deploys","Running WebPageTest Scripts Against Preview Deploys",{"path":2505,"title":2506},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fperformance-budgets-and-lighthouse-ci\u002Fsetting-up-lighthouse-ci-for-a-static-site","Setting Up Lighthouse CI for a Static Site",{"path":2508,"title":2509},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fperformance-budgets-and-lighthouse-ci\u002Ftracking-bundle-size-per-pull-request","Tracking Bundle Size per Pull Request",{"path":2511,"title":2512},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fperformance-budgets-and-lighthouse-ci\u002Ftracking-page-weight-over-time","Tracking Page Weight Over Time",{"path":2514,"title":2515},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fperformance-budgets-and-lighthouse-ci\u002Fwriting-a-performance-budget-that-fails-builds","Writing a Performance Budget That Fails Builds",{"path":2517,"title":2518},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fresource-hints-and-navigation-speed\u002Fauditing-unused-preloads","Auditing Unused Preloads",{"path":2520,"title":2521},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fresource-hints-and-navigation-speed\u002Fearly-hints-103-on-cloudflare","Early Hints (103) on Cloudflare",{"path":2523,"title":2524},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fresource-hints-and-navigation-speed\u002Ffetchpriority-beyond-the-hero-image","Fetchpriority Beyond the Hero Image",{"path":2526,"title":2527},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fresource-hints-and-navigation-speed\u002Ffixing-wasted-preloads-flagged-by-chrome","Fixing Wasted Preloads Flagged by Chrome",{"path":2529,"title":2530},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fresource-hints-and-navigation-speed","Resource Hints and Navigation Speed",{"path":2532,"title":2533},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fresource-hints-and-navigation-speed\u002Finstant-navigation-with-speculation-rules","Instant Navigation with Speculation Rules",{"path":2535,"title":2536},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fresource-hints-and-navigation-speed\u002Fpreconnect-vs-dns-prefetch-on-static-sites","Preconnect vs DNS-Prefetch on Static Sites",{"path":2538,"title":2539},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fresource-hints-and-navigation-speed\u002Fprefetching-links-in-astro","Prefetching Links in Astro",{"path":2541,"title":2542},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fresource-hints-and-navigation-speed\u002Fview-transitions-in-astro-without-hurting-vitals","View Transitions in Astro Without Hurting Vitals",{"path":2544,"title":2545},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fresource-hints-and-navigation-speed\u002Fview-transitions-on-multi-page-static-sites","View Transitions on Multi-Page Static Sites",{"path":2547,"title":2548},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fthird-party-script-performance-on-static-sites\u002Fauditing-third-party-scripts-with-lighthouse","Auditing Third-Party Scripts With Lighthouse",{"path":2550,"title":2551},"\u002Fperformance-optimization-core-web-vitals-for-ssgs\u002Fthird-party-script-performance-on-static-sites\u002Ffacades-for-chat-widgets-and-maps","Facades for Chat Widgets and 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