[{"data":1,"prerenderedAt":975},["ShallowReactive",2],{"navigation_docs":3,"-build-on-top-tail-sampling":454,"-build-on-top-tail-sampling-surround":970},[4,35,159,201,289,352,438],{"title":5,"path":6,"stem":7,"children":8,"page":34},"Getting Started","\u002Fgetting-started","1.getting-started",[9,14,19,24,29],{"title":10,"path":11,"stem":12,"icon":13},"Introduction","\u002Fgetting-started\u002Fintroduction","1.getting-started\u002F1.introduction","i-lucide-info",{"title":15,"path":16,"stem":17,"icon":18},"Installation","\u002Fgetting-started\u002Finstallation","1.getting-started\u002F2.installation","i-lucide-download",{"title":20,"path":21,"stem":22,"icon":23},"Quick Start","\u002Fgetting-started\u002Fquick-start","1.getting-started\u002F3.quick-start","i-lucide-zap",{"title":25,"path":26,"stem":27,"icon":28},"Agent Skills","\u002Fgetting-started\u002Fagent-skills","1.getting-started\u002F4.agent-skills","i-lucide-sparkles",{"title":30,"path":31,"stem":32,"icon":33},"vs Other Loggers","\u002Fgetting-started\u002Fvs-other-loggers","1.getting-started\u002F5.vs-other-loggers","i-lucide-scale",false,{"title":36,"path":37,"stem":38,"children":39,"page":34},"Logging","\u002Flogging","2.logging",[40,45,50,55,60,65,70,99,127],{"title":41,"path":42,"stem":43,"icon":44},"Overview","\u002Flogging\u002Foverview","2.logging\u002F0.overview","i-lucide-list",{"title":46,"path":47,"stem":48,"icon":49},"Simple Logging","\u002Flogging\u002Fsimple-logging","2.logging\u002F1.simple-logging","i-lucide-terminal",{"title":51,"path":52,"stem":53,"icon":54},"Wide Events","\u002Flogging\u002Fwide-events","2.logging\u002F2.wide-events","i-lucide-layers",{"title":56,"path":57,"stem":58,"icon":59},"Structured Errors","\u002Flogging\u002Fstructured-errors","2.logging\u002F3.structured-errors","i-lucide-shield-alert",{"title":61,"path":62,"stem":63,"icon":64},"Catalogs","\u002Flogging\u002Fcatalogs","2.logging\u002F4.catalogs","i-lucide-book-open",{"title":66,"path":67,"stem":68,"icon":69},"Client Logging","\u002Flogging\u002Fclient-logging","2.logging\u002F5.client-logging","i-lucide-monitor",{"title":71,"icon":72,"path":73,"stem":74,"children":75,"page":34},"AI SDK","i-simple-icons-vercel","\u002Flogging\u002Fai-sdk","2.logging\u002F6.ai-sdk",[76,79,84,89,94],{"title":41,"path":77,"stem":78,"icon":44},"\u002Flogging\u002Fai-sdk\u002Foverview","2.logging\u002F6.ai-sdk\u002F01.overview",{"title":80,"path":81,"stem":82,"icon":83},"Usage","\u002Flogging\u002Fai-sdk\u002Fusage","2.logging\u002F6.ai-sdk\u002F02.usage","i-lucide-code",{"title":85,"path":86,"stem":87,"icon":88},"Options","\u002Flogging\u002Fai-sdk\u002Foptions","2.logging\u002F6.ai-sdk\u002F03.options","i-lucide-sliders",{"title":90,"path":91,"stem":92,"icon":93},"Metadata","\u002Flogging\u002Fai-sdk\u002Fmetadata","2.logging\u002F6.ai-sdk\u002F04.metadata","i-lucide-database",{"title":95,"path":96,"stem":97,"icon":98},"Telemetry","\u002Flogging\u002Fai-sdk\u002Ftelemetry","2.logging\u002F6.ai-sdk\u002F05.telemetry","i-lucide-activity",{"title":100,"icon":101,"path":102,"stem":103,"children":104,"page":34},"Better Auth","i-simple-icons-betterauth","\u002Flogging\u002Fbetter-auth","2.logging\u002F7.better-auth",[105,108,113,118,122],{"title":41,"path":106,"stem":107,"icon":44},"\u002Flogging\u002Fbetter-auth\u002Foverview","2.logging\u002F7.better-auth\u002F01.overview",{"title":109,"path":110,"stem":111,"icon":112},"Identify User","\u002Flogging\u002Fbetter-auth\u002Fidentify-user","2.logging\u002F7.better-auth\u002F02.identify-user","i-lucide-user-check",{"title":114,"path":115,"stem":116,"icon":117},"Middleware","\u002Flogging\u002Fbetter-auth\u002Fmiddleware","2.logging\u002F7.better-auth\u002F03.middleware","i-lucide-shield",{"title":119,"path":120,"stem":121,"icon":69},"Client Sync","\u002Flogging\u002Fbetter-auth\u002Fclient-sync","2.logging\u002F7.better-auth\u002F04.client-sync",{"title":123,"path":124,"stem":125,"icon":126},"Performance","\u002Flogging\u002Fbetter-auth\u002Fperformance","2.logging\u002F7.better-auth\u002F05.performance","i-lucide-gauge",{"title":128,"icon":129,"path":130,"stem":131,"children":132,"page":34},"Audit Logs","i-lucide-shield-check","\u002Flogging\u002Faudit","2.logging\u002F8.audit",[133,136,141,146,151,155],{"title":41,"path":134,"stem":135,"icon":44},"\u002Flogging\u002Faudit\u002Foverview","2.logging\u002F8.audit\u002F01.overview",{"title":137,"path":138,"stem":139,"icon":140},"Schema","\u002Flogging\u002Faudit\u002Fschema","2.logging\u002F8.audit\u002F02.schema","i-lucide-file-text",{"title":142,"path":143,"stem":144,"icon":145},"Recording","\u002Flogging\u002Faudit\u002Frecording","2.logging\u002F8.audit\u002F03.recording","i-lucide-pen-line",{"title":147,"path":148,"stem":149,"icon":150},"Drains","\u002Flogging\u002Faudit\u002Fpipeline","2.logging\u002F8.audit\u002F04.pipeline","i-lucide-link",{"title":152,"path":153,"stem":154,"icon":129},"Compliance","\u002Flogging\u002Faudit\u002Fcompliance","2.logging\u002F8.audit\u002F05.compliance",{"title":156,"path":157,"stem":158,"icon":64},"Recipes","\u002Flogging\u002Faudit\u002Frecipes","2.logging\u002F8.audit\u002F06.recipes",{"title":160,"path":161,"stem":162,"children":163,"page":34},"Core Concepts","\u002Fcore-concepts","3.core-concepts",[164,169,174,179,184,188,191,196],{"title":165,"path":166,"stem":167,"icon":168},"Lifecycle","\u002Fcore-concepts\u002Flifecycle","3.core-concepts\u002F0.lifecycle","i-lucide-arrow-right-left",{"title":170,"path":171,"stem":172,"icon":173},"Configuration","\u002Fcore-concepts\u002Fconfiguration","3.core-concepts\u002F1.configuration","i-lucide-settings",{"title":175,"path":176,"stem":177,"icon":178},"Sampling","\u002Fcore-concepts\u002Fsampling","3.core-concepts\u002F2.sampling","i-lucide-filter",{"title":180,"path":181,"stem":182,"icon":183},"Typed Fields","\u002Fcore-concepts\u002Ftyped-fields","3.core-concepts\u002F3.typed-fields","i-simple-icons-typescript",{"title":185,"path":186,"stem":187,"icon":129},"Best Practices","\u002Fcore-concepts\u002Fbest-practices","3.core-concepts\u002F4.best-practices",{"title":123,"path":189,"stem":190,"icon":126},"\u002Fcore-concepts\u002Fperformance","3.core-concepts\u002F5.performance",{"title":192,"path":193,"stem":194,"icon":195},"Vite Plugin","\u002Fcore-concepts\u002Fvite-plugin","3.core-concepts\u002F6.vite-plugin","i-custom-vite",{"title":197,"path":198,"stem":199,"icon":200},"Auto-Redaction","\u002Fcore-concepts\u002Fredaction","3.core-concepts\u002F7.redaction","i-lucide-eye-off",{"title":202,"path":203,"stem":204,"children":205,"page":34},"Frameworks","\u002Fframeworks","4.frameworks",[206,210,215,220,225,230,235,240,245,250,255,260,265,270,274,279,284],{"title":41,"path":207,"stem":208,"icon":209},"\u002Fframeworks\u002Foverview","4.frameworks\u002F00.overview","i-lucide-layout-grid",{"title":211,"path":212,"stem":213,"icon":214},"Nuxt","\u002Fframeworks\u002Fnuxt","4.frameworks\u002F01.nuxt","i-simple-icons-nuxtdotjs",{"title":216,"path":217,"stem":218,"icon":219},"Next.js","\u002Fframeworks\u002Fnextjs","4.frameworks\u002F02.nextjs","i-simple-icons-nextdotjs",{"title":221,"path":222,"stem":223,"icon":224},"SvelteKit","\u002Fframeworks\u002Fsveltekit","4.frameworks\u002F03.sveltekit","i-simple-icons-svelte",{"title":226,"path":227,"stem":228,"icon":229},"Nitro","\u002Fframeworks\u002Fnitro","4.frameworks\u002F04.nitro","i-custom-nitro",{"title":231,"path":232,"stem":233,"icon":234},"TanStack Start","\u002Fframeworks\u002Ftanstack-start","4.frameworks\u002F05.tanstack-start","i-custom-tanstack",{"title":236,"path":237,"stem":238,"icon":239},"NestJS","\u002Fframeworks\u002Fnestjs","4.frameworks\u002F06.nestjs","i-simple-icons-nestjs",{"title":241,"path":242,"stem":243,"icon":244},"Express","\u002Fframeworks\u002Fexpress","4.frameworks\u002F07.express","i-simple-icons-express",{"title":246,"path":247,"stem":248,"icon":249},"Hono","\u002Fframeworks\u002Fhono","4.frameworks\u002F08.hono","i-simple-icons-hono",{"title":251,"path":252,"stem":253,"icon":254},"Fastify","\u002Fframeworks\u002Ffastify","4.frameworks\u002F09.fastify","i-simple-icons-fastify",{"title":256,"path":257,"stem":258,"icon":259},"Elysia","\u002Fframeworks\u002Felysia","4.frameworks\u002F10.elysia","i-custom-elysia",{"title":261,"path":262,"stem":263,"icon":264},"React Router","\u002Fframeworks\u002Freact-router","4.frameworks\u002F11.react-router","i-custom-reactrouter",{"title":266,"path":267,"stem":268,"icon":269},"Cloudflare Workers","\u002Fframeworks\u002Fcloudflare-workers","4.frameworks\u002F12.cloudflare-workers","i-simple-icons-cloudflare",{"title":271,"path":272,"stem":273,"icon":183},"Standalone","\u002Fframeworks\u002Fstandalone","4.frameworks\u002F13.standalone",{"title":275,"path":276,"stem":277,"icon":278},"Astro","\u002Fframeworks\u002Fastro","4.frameworks\u002F14.astro","i-simple-icons-astro",{"title":280,"path":281,"stem":282,"icon":283},"AWS Lambda","\u002Fframeworks\u002Faws-lambda","4.frameworks\u002F16.aws-lambda","i-custom-lambda",{"title":285,"path":286,"stem":287,"icon":288},"Custom Integration","\u002Fframeworks\u002Fcustom-integration","4.frameworks\u002F17.custom-integration","i-lucide-puzzle",{"title":290,"path":291,"stem":292,"children":293,"page":34},"Build on top","\u002Fbuild-on-top","5.build-on-top",[294,297,302,307,312,316,321,326,330,334,338,342,347],{"title":41,"path":295,"stem":296,"icon":54},"\u002Fbuild-on-top\u002Foverview","5.build-on-top\u002F0.overview",{"title":298,"path":299,"stem":300,"icon":301},"In-process stream","\u002Fbuild-on-top\u002Fin-process-stream","5.build-on-top\u002F1.in-process-stream","i-lucide-radio-tower",{"title":303,"path":304,"stem":305,"icon":306},"Fanout","\u002Fbuild-on-top\u002Ffanout-and-multi-drain","5.build-on-top\u002F10.fanout-and-multi-drain","i-lucide-share-2",{"title":308,"path":309,"stem":310,"icon":311},"Identity headers","\u002Fbuild-on-top\u002Fidentity-headers","5.build-on-top\u002F11.identity-headers","i-lucide-fingerprint",{"title":313,"path":314,"stem":315,"icon":288},"Custom framework","\u002Fbuild-on-top\u002Fcustom-framework","5.build-on-top\u002F12.custom-framework",{"title":317,"path":318,"stem":319,"icon":320},"Stream server","\u002Fbuild-on-top\u002Fstream-server","5.build-on-top\u002F2.stream-server","i-lucide-radio",{"title":322,"path":323,"stem":324,"icon":325},"FS reader","\u002Fbuild-on-top\u002Ffs-reader","5.build-on-top\u002F3.fs-reader","i-lucide-folder-search",{"title":156,"path":327,"stem":328,"icon":329},"\u002Fbuild-on-top\u002Fconsumer-recipes","5.build-on-top\u002F4.consumer-recipes","i-lucide-chef-hat",{"title":331,"path":332,"stem":333,"icon":288},"Plugins","\u002Fbuild-on-top\u002Fplugins","5.build-on-top\u002F5.plugins",{"title":335,"path":336,"stem":337,"icon":28},"Custom enrichers","\u002Fbuild-on-top\u002Fcustom-enrichers","5.build-on-top\u002F6.custom-enrichers",{"title":339,"path":340,"stem":341,"icon":178},"Tail sampling","\u002Fbuild-on-top\u002Ftail-sampling","5.build-on-top\u002F7.tail-sampling",{"title":343,"path":344,"stem":345,"icon":346},"Custom drains","\u002Fbuild-on-top\u002Fcustom-drains","5.build-on-top\u002F8.custom-drains","i-lucide-code-2",{"title":348,"path":349,"stem":350,"icon":351},"Drain pipeline","\u002Fbuild-on-top\u002Fdrain-pipeline","5.build-on-top\u002F9.drain-pipeline","i-lucide-workflow",{"title":353,"path":354,"stem":355,"children":356,"page":34},"Adapters","\u002Fadapters","6.adapters",[357,360,400,415],{"title":41,"path":358,"stem":359,"icon":44},"\u002Fadapters\u002Foverview","6.adapters\u002F01.overview",{"title":361,"path":362,"stem":363,"children":364,"page":34},"Cloud destinations","\u002Fadapters\u002Fcloud","6.adapters\u002F02.cloud",[365,370,375,380,385,390,395],{"title":366,"path":367,"stem":368,"icon":369},"Axiom","\u002Fadapters\u002Fcloud\u002Faxiom","6.adapters\u002F02.cloud\u002F01.axiom","i-custom-axiom",{"title":371,"path":372,"stem":373,"icon":374},"OTLP","\u002Fadapters\u002Fcloud\u002Fotlp","6.adapters\u002F02.cloud\u002F02.otlp","i-simple-icons-opentelemetry",{"title":376,"path":377,"stem":378,"icon":379},"PostHog","\u002Fadapters\u002Fcloud\u002Fposthog","6.adapters\u002F02.cloud\u002F03.posthog","i-simple-icons-posthog",{"title":381,"path":382,"stem":383,"icon":384},"Sentry","\u002Fadapters\u002Fcloud\u002Fsentry","6.adapters\u002F02.cloud\u002F04.sentry","i-simple-icons-sentry",{"title":386,"path":387,"stem":388,"icon":389},"Better Stack","\u002Fadapters\u002Fcloud\u002Fbetter-stack","6.adapters\u002F02.cloud\u002F05.better-stack","i-simple-icons-betterstack",{"title":391,"path":392,"stem":393,"icon":394},"Datadog","\u002Fadapters\u002Fcloud\u002Fdatadog","6.adapters\u002F02.cloud\u002F06.datadog","i-simple-icons-datadog",{"title":396,"path":397,"stem":398,"icon":399},"HyperDX","\u002Fadapters\u002Fcloud\u002Fhyperdx","6.adapters\u002F02.cloud\u002F07.hyperdx","i-custom-hyperdx",{"title":401,"path":402,"stem":403,"children":404,"page":34},"Self-hosted","\u002Fadapters\u002Fself-hosted","6.adapters\u002F03.self-hosted",[405,410],{"title":406,"path":407,"stem":408,"icon":409},"File System","\u002Fadapters\u002Fself-hosted\u002Ffs","6.adapters\u002F03.self-hosted\u002F01.fs","i-lucide-hard-drive",{"title":411,"path":412,"stem":413,"icon":414},"NuxtHub","\u002Fadapters\u002Fself-hosted\u002Fnuxthub","6.adapters\u002F03.self-hosted\u002F02.nuxthub","i-simple-icons-nuxt",{"title":416,"path":417,"stem":418,"children":419,"page":34},"Building blocks","\u002Fadapters\u002Fbuilding-blocks","6.adapters\u002F04.building-blocks",[420,424,429,433],{"title":421,"path":422,"stem":423,"icon":351},"Pipeline","\u002Fadapters\u002Fbuilding-blocks\u002Fpipeline","6.adapters\u002F04.building-blocks\u002F01.pipeline",{"title":425,"path":426,"stem":427,"icon":428},"HTTP","\u002Fadapters\u002Fbuilding-blocks\u002Fhttp","6.adapters\u002F04.building-blocks\u002F02.http","i-lucide-globe",{"title":430,"path":431,"stem":432,"icon":83},"Custom Adapters","\u002Fadapters\u002Fbuilding-blocks\u002Fcustom","6.adapters\u002F04.building-blocks\u002F03.custom",{"title":434,"path":435,"stem":436,"icon":437},"Toolkit","\u002Fadapters\u002Fbuilding-blocks\u002Ftoolkit","6.adapters\u002F04.building-blocks\u002F04.toolkit","i-lucide-blocks",{"title":439,"path":440,"stem":441,"children":442,"page":34},"Enrichers","\u002Fenrichers","7.enrichers",[443,446,450],{"title":41,"path":444,"stem":445,"icon":28},"\u002Fenrichers\u002Foverview","7.enrichers\u002F1.overview",{"title":447,"path":448,"stem":449,"icon":288},"Built-in","\u002Fenrichers\u002Fbuilt-in","7.enrichers\u002F2.built-in",{"title":451,"path":452,"stem":453,"icon":83},"Custom","\u002Fenrichers\u002Fcustom","7.enrichers\u002F3.custom",{"id":455,"title":339,"body":456,"description":963,"extension":964,"links":965,"meta":966,"navigation":967,"path":340,"seo":968,"stem":341,"__hash__":969},"docs\u002F5.build-on-top\u002F7.tail-sampling.md",{"type":457,"value":458,"toc":958},"minimark",[459,471,474,546,551,557,585,592,596,602,624,780,783,938,942,954],[460,461,462,465,466,470],"p",{},[463,464,339],"strong",{}," is a decision made ",[467,468,469],"em",{},"after"," the request runs, with full knowledge of its outcome (status, duration, errors, custom flags). It's how you keep all errors and slow requests while throwing away the bulk of healthy traffic — the opposite of head sampling, which decides up front before knowing what happens.",[472,473],"tail-sample-decision",{},[475,476,479,482,537],"prompt",{":actions":477,"description":478,"icon":178},"[\"copy\",\"cursor\",\"windsurf\"]","Configure tail sampling on evlog",[460,480,481],{},"Set up tail sampling so I keep all errors and slow requests while dropping healthy noise.",[483,484,485,493,516,519,530],"ul",{},[486,487,488,489],"li",{},"Start with the built-in declarative rules: ",[490,491,492],"code",{},"evlog.sampling.keep = { status: '>=400', duration: '>1000', path: ['\u002Fapi\u002Fauth\u002F*'] }",[486,494,495,496,499,500,503,504,507,508,511,512,515],{},"For multi-field or derived conditions, register an ",[490,497,498],{},"evlog:emit:keep"," hook (Nitro: ",[490,501,502],{},"nitroApp.hooks.hook('evlog:emit:keep', (ctx) => ...)","); return ",[490,505,506],{},"true"," to keep, ",[490,509,510],{},"false"," to drop, ",[490,513,514],{},"undefined"," to defer to other rules",[486,517,518],{},"Keep the hook fast — it runs on every request after enrichment; no I\u002FO, no async work",[486,520,521,522,525,526,529],{},"Combine with head sampling (e.g. 10% of healthy traffic) by setting both ",[490,523,524],{},"sample"," (head) and ",[490,527,528],{},"keep"," (tail)",[486,531,532,533,536],{},"Always keep error events (",[490,534,535],{},"level: 'error'",") regardless of sampling; double-check rules don't accidentally drop them",[460,538,539,540],{},"Docs: ",[541,542,543],"a",{"href":543,"rel":544},"https:\u002F\u002Fwww.evlog.dev\u002Fbuild-on-top\u002Ftail-sampling",[545],"nofollow",[547,548,550],"h2",{"id":549},"canonical-guide","Canonical guide",[460,552,553,554,556],{},"Full reference at ",[541,555,175],{"href":176},", section \"Tail sampling\":",[483,558,559,576,582],{},[486,560,561,562,564,565,568,569,568,572,575],{},"Built-in ",[490,563,528],{}," rules (",[490,566,567],{},"status",", ",[490,570,571],{},"duration",[490,573,574],{},"path",")",[486,577,578,579,581],{},"Custom predicates via ",[490,580,498],{}," hook",[486,583,584],{},"Combining head + tail sampling",[460,586,587,588,591],{},"This page exists in the ",[463,589,590],{},"build-on-top"," section as a pointer — same content, classified by axis.",[547,593,595],{"id":594},"when-to-write-a-custom-keep-hook","When to write a custom keep hook",[460,597,598,599,601],{},"The built-in declarative ",[490,600,528],{}," rules cover the typical cases. Drop to a custom hook when you need :",[483,603,604,615,621],{},[486,605,606,607,610,611,614],{},"Conditional logic on more than one field (e.g. \"keep if ",[490,608,609],{},"status >= 500"," AND ",[490,612,613],{},"user.plan === 'enterprise'","\")",[486,616,617,618,614],{},"Keep based on a derived value (e.g. \"keep if ",[490,619,620],{},"event.audit?.context.actor.role === 'admin'",[486,622,623],{},"Stateful decisions (rare; needs care since sampling runs in the hot path)",[625,626,631],"pre",{"className":627,"code":628,"language":629,"meta":630,"style":630},"language-ts shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","nitroApp.hooks.hook('evlog:emit:keep', (ctx) => {\n  if (ctx.context.user?.plan === 'enterprise' && ctx.status >= 500) {\n    ctx.shouldKeep = true\n  }\n})\n","ts","",[490,632,633,685,747,765,771],{"__ignoreMap":630},[634,635,638,642,646,649,651,655,658,661,664,666,669,672,676,678,682],"span",{"class":636,"line":637},"line",1,[634,639,641],{"class":640},"sTEyZ","nitroApp",[634,643,645],{"class":644},"sMK4o",".",[634,647,648],{"class":640},"hooks",[634,650,645],{"class":644},[634,652,654],{"class":653},"s2Zo4","hook",[634,656,657],{"class":640},"(",[634,659,660],{"class":644},"'",[634,662,498],{"class":663},"sfazB",[634,665,660],{"class":644},[634,667,668],{"class":644},",",[634,670,671],{"class":644}," (",[634,673,675],{"class":674},"sHdIc","ctx",[634,677,575],{"class":644},[634,679,681],{"class":680},"spNyl"," =>",[634,683,684],{"class":644}," {\n",[634,686,688,692,695,697,699,702,704,707,710,713,716,719,722,724,727,730,732,734,737,741,744],{"class":636,"line":687},2,[634,689,691],{"class":690},"s7zQu","  if",[634,693,671],{"class":694},"swJcz",[634,696,675],{"class":640},[634,698,645],{"class":644},[634,700,701],{"class":640},"context",[634,703,645],{"class":644},[634,705,706],{"class":640},"user",[634,708,709],{"class":644},"?.",[634,711,712],{"class":640},"plan",[634,714,715],{"class":644}," ===",[634,717,718],{"class":644}," '",[634,720,721],{"class":663},"enterprise",[634,723,660],{"class":644},[634,725,726],{"class":644}," &&",[634,728,729],{"class":640}," ctx",[634,731,645],{"class":644},[634,733,567],{"class":640},[634,735,736],{"class":644}," >=",[634,738,740],{"class":739},"sbssI"," 500",[634,742,743],{"class":694},") ",[634,745,746],{"class":644},"{\n",[634,748,750,753,755,758,761],{"class":636,"line":749},3,[634,751,752],{"class":640},"    ctx",[634,754,645],{"class":644},[634,756,757],{"class":640},"shouldKeep",[634,759,760],{"class":644}," =",[634,762,764],{"class":763},"sfNiH"," true\n",[634,766,768],{"class":636,"line":767},4,[634,769,770],{"class":644},"  }\n",[634,772,774,777],{"class":636,"line":773},5,[634,775,776],{"class":644},"}",[634,778,779],{"class":640},")\n",[460,781,782],{},"Or as a plugin (preferred for non-trivial logic):",[625,784,786],{"className":627,"code":785,"language":629,"meta":630,"style":630},"import { definePlugin } from 'evlog\u002Ftoolkit'\n\ndefinePlugin({\n  name: 'keep-enterprise-errors',\n  keep(ctx) {\n    if (ctx.context.user?.plan === 'enterprise' && ctx.status >= 500) {\n      ctx.shouldKeep = true\n    }\n  },\n})\n",[490,787,788,813,819,828,846,859,905,919,925,931],{"__ignoreMap":630},[634,789,790,793,796,799,802,805,807,810],{"class":636,"line":637},[634,791,792],{"class":690},"import",[634,794,795],{"class":644}," {",[634,797,798],{"class":640}," definePlugin",[634,800,801],{"class":644}," }",[634,803,804],{"class":690}," from",[634,806,718],{"class":644},[634,808,809],{"class":663},"evlog\u002Ftoolkit",[634,811,812],{"class":644},"'\n",[634,814,815],{"class":636,"line":687},[634,816,818],{"emptyLinePlaceholder":817},true,"\n",[634,820,821,824,826],{"class":636,"line":749},[634,822,823],{"class":653},"definePlugin",[634,825,657],{"class":640},[634,827,746],{"class":644},[634,829,830,833,836,838,841,843],{"class":636,"line":767},[634,831,832],{"class":694},"  name",[634,834,835],{"class":644},":",[634,837,718],{"class":644},[634,839,840],{"class":663},"keep-enterprise-errors",[634,842,660],{"class":644},[634,844,845],{"class":644},",\n",[634,847,848,851,853,855,857],{"class":636,"line":773},[634,849,850],{"class":694},"  keep",[634,852,657],{"class":644},[634,854,675],{"class":674},[634,856,575],{"class":644},[634,858,684],{"class":644},[634,860,862,865,867,869,871,873,875,877,879,881,883,885,887,889,891,893,895,897,899,901,903],{"class":636,"line":861},6,[634,863,864],{"class":690},"    if",[634,866,671],{"class":694},[634,868,675],{"class":640},[634,870,645],{"class":644},[634,872,701],{"class":640},[634,874,645],{"class":644},[634,876,706],{"class":640},[634,878,709],{"class":644},[634,880,712],{"class":640},[634,882,715],{"class":644},[634,884,718],{"class":644},[634,886,721],{"class":663},[634,888,660],{"class":644},[634,890,726],{"class":644},[634,892,729],{"class":640},[634,894,645],{"class":644},[634,896,567],{"class":640},[634,898,736],{"class":644},[634,900,740],{"class":739},[634,902,743],{"class":694},[634,904,746],{"class":644},[634,906,908,911,913,915,917],{"class":636,"line":907},7,[634,909,910],{"class":640},"      ctx",[634,912,645],{"class":644},[634,914,757],{"class":640},[634,916,760],{"class":644},[634,918,764],{"class":763},[634,920,922],{"class":636,"line":921},8,[634,923,924],{"class":644},"    }\n",[634,926,928],{"class":636,"line":927},9,[634,929,930],{"class":644},"  },\n",[634,932,934,936],{"class":636,"line":933},10,[634,935,776],{"class":644},[634,937,779],{"class":640},[547,939,941],{"id":940},"going-further","Going further",[483,943,944,949],{},[486,945,946,948],{},[541,947,331],{"href":332}," when the keep decision is part of a broader feature",[486,950,951,953],{},[541,952,175],{"href":176}," for the full theory and config reference",[955,956,957],"style",{},"html pre.shiki code .sTEyZ, html code.shiki .sTEyZ{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .s2Zo4, html code.shiki .s2Zo4{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .sfazB, html code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .sHdIc, html code.shiki .sHdIc{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#EEFFFF;--shiki-default-font-style:italic;--shiki-dark:#BABED8;--shiki-dark-font-style:italic}html pre.shiki code .spNyl, html code.shiki .spNyl{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .s7zQu, html code.shiki .s7zQu{--shiki-light:#39ADB5;--shiki-light-font-style:italic;--shiki-default:#89DDFF;--shiki-default-font-style:italic;--shiki-dark:#89DDFF;--shiki-dark-font-style:italic}html pre.shiki code .swJcz, html code.shiki .swJcz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .sbssI, html code.shiki .sbssI{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}html pre.shiki code .sfNiH, html code.shiki .sfNiH{--shiki-light:#FF5370;--shiki-default:#FF9CAC;--shiki-dark:#FF9CAC}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}",{"title":630,"searchDepth":687,"depth":687,"links":959},[960,961,962],{"id":549,"depth":687,"text":550},{"id":594,"depth":687,"text":595},{"id":940,"depth":687,"text":941},"Decide post-hoc whether to keep an event based on the request outcome — keep all errors, keep slow requests, keep specific paths, drop the rest.","md",null,{},{"title":339,"icon":178},{"title":339,"description":963},"1CynxT3IdrKpoipOuZ-VlWOVuPEEJ4uPCvBjY13dPTE",[971,973],{"title":335,"path":336,"stem":337,"description":972,"icon":28,"children":-1},"defineEnricher derives context from request headers, env, or anything else, and adds it to every wide event before drain — without touching call sites.",{"title":343,"path":344,"stem":345,"description":974,"icon":346,"children":-1},"defineDrain and defineHttpDrain — write your own drain to ship wide events to any backend without a built-in adapter.",1778340943357]