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OpenTelemetry","\u002Fcompare\u002Fopentelemetry","8.compare\u002F2.opentelemetry",{"title":601,"path":602,"stem":603,"icon":577},"evlog vs LogTape","\u002Fcompare\u002Flogtape","8.compare\u002F3.logtape",{"title":605,"path":606,"stem":607,"icon":577},"evlog vs Winston: formats and request events","\u002Fcompare\u002Fwinston","8.compare\u002F4.winston",{"title":609,"path":610,"stem":611,"icon":577},"evlog vs Consola: reporters and request context","\u002Fcompare\u002Fconsola","8.compare\u002F5.consola",{"id":613,"title":614,"body":615,"description":909,"extension":910,"links":911,"meta":919,"navigation":920,"path":495,"seo":921,"stem":496,"__hash__":922},"docs\u002F6.extend\u002F0.overview.md","Extend evlog",{"type":616,"value":617,"toc":898},"minimark",[618,640,645,655,659,664,675,737,741,748,804,808,811,851,855,870],[619,620,621,622,626,627,630,631,634,635,639],"p",{},"evlog is designed to be extended on both ends. You can ",[623,624,625],"strong",{},"observe"," what flows through (without altering the pipeline), ",[623,628,629],{},"plug into"," the pipeline (enrich, decide what to keep, react to lifecycle events), or ",[623,632,633],{},"build your own bricks"," (custom drains for unsupported destinations, your own framework integration). Each page in this section ships with a ",[636,637,638],"code",{},"::prompt"," block you can drop into Cursor \u002F Claude to scaffold the integration in your own app.",[641,642,644],"h2",{"id":643},"mental-model","Mental model",[646,647,653],"pre",{"className":648,"code":650,"language":651,"meta":652},[649],"language-text","your app code\n     │\n     │  emit\n     ▼\n┌──────────────────────────────────────────────────────────────────┐\n│   evlog pipeline                                                 │\n│                                                                  │\n│   request lifecycle  →  enrich  →  tail sample  →  drain         │\n│                                                                  │\n└──────────────────────────────────────────────────────────────────┘\n     │                                                  │\n     │  observe (no mutation)                           │  ship\n     ▼                                                  ▼\n┌─────────────────────────────────────────┐    ┌─────────────────────┐\n│   stream (in-process + SSE bridge)      │    │   custom drains     │\n│   fs reader (NDJSON history)            │    │   drain pipeline    │\n│   diagnostics channel (evlog.event)     │    │   (batch + fanout)  │\n│   consumer recipes (devtools, dashboards)│    │                     │\n└─────────────────────────────────────────┘    └─────────────────────┘\n","text","",[636,654,650],{"__ignoreMap":652},[641,656,658],{"id":657},"three-ways-to-extend","Three ways to extend",[660,661,663],"h3",{"id":662},"observe-the-pipeline-no-mutation","Observe the pipeline (no mutation)",[619,665,666,667,670,671,674],{},"Subscribe to events without changing what gets emitted. The stream is the live feed, the fs reader is the historic log, the diagnostics channel lets a consumer subscribe by channel name alone, and consumer recipes show you how to wire any of them to a devtool, dashboard, CLI tail, or ",[636,668,669],{},"curl"," + ",[636,672,673],{},"jq",".",[676,677,678,691],"table",{},[679,680,681],"thead",{},[682,683,684,688],"tr",{},[685,686,687],"th",{},"You want to…",[685,689,690],{},"Use",[692,693,694,705,714,728],"tbody",{},[682,695,696,700],{},[697,698,699],"td",{},"Subscribe to live events (in-process or over SSE for browsers \u002F CLIs)",[697,701,702],{},[703,704,499],"a",{"href":500},[682,706,707,710],{},[697,708,709],{},"Replay or tail historic events from disk",[697,711,712],{},[703,713,513],{"href":514},[682,715,716,723],{},[697,717,718,719,670,721],{},"Build a small consumer panel, devtool, or pipe to ",[636,720,669],{},[636,722,673],{},[697,724,725],{},[703,726,727],{"href":518},"Consumer recipes",[682,729,730,733],{},[697,731,732],{},"Let a consumer subscribe without importing evlog, or reach a Cloudflare Tail Worker",[697,734,735],{},[703,736,509],{"href":510},[660,738,740],{"id":739},"plug-into-the-pipeline","Plug into the pipeline",[619,742,743,744,747],{},"Hook into the pipeline at one or more of its lifecycle stages. The four pages below cover the entire extension surface. Pick one when you have a single concern, pick ",[636,745,746],{},"definePlugin"," when you have several.",[676,749,750,758],{},[679,751,752],{},[682,753,754,756],{},[685,755,687],{},[685,757,690],{},[692,759,760,769,778,787],{},[682,761,762,765],{},[697,763,764],{},"React to lifecycle events from a single cohesive object (multiple hooks share state)",[697,766,767],{},[703,768,522],{"href":523},[682,770,771,774],{},[697,772,773],{},"Add a derived field on every event automatically",[697,775,776],{},[703,777,526],{"href":527},[682,779,780,783],{},[697,781,782],{},"Decide post-hoc whether to keep an event (status, duration, custom logic)",[697,784,785],{},[703,786,530],{"href":531},[682,788,789,800],{},[697,790,791,792,795,796,799],{},"Identify your evlog traffic on the receiver side (override ",[636,793,794],{},"User-Agent"," \u002F ",[636,797,798],{},"X-Evlog-Source",")",[697,801,802],{},[703,803,534],{"href":535},[660,805,807],{"id":806},"build-your-own-bricks","Build your own bricks",[619,809,810],{},"When the built-in adapters or framework integrations don't cover what you need, the toolkit lets you build your own with the same shape and ergonomics.",[676,812,813,821],{},[679,814,815],{},[682,816,817,819],{},[685,818,687],{},[685,820,690],{},[692,822,823,832,841],{},[682,824,825,828],{},[697,826,827],{},"Ship events to a backend without a built-in adapter (HTTP or any other transport)",[697,829,830],{},[703,831,539],{"href":540},[682,833,834,837],{},[697,835,836],{},"Wrap any drain in batch + retry + fanout for production",[697,838,839],{},[703,840,544],{"href":545},[682,842,843,846],{},[697,844,845],{},"Support a framework that's not in the list, or a non-HTTP runtime",[697,847,848],{},[703,849,850],{"href":505},"Custom framework integration",[641,852,854],{"id":853},"what-works-where","What works where",[619,856,857,858,861,862,865,866,869],{},"Only the ",[703,859,860],{"href":500},"stream"," (in-process bus + SSE bridge) is ",[623,863,864],{},"local-only",": it lives inside one Node \u002F Bun \u002F Deno process and does not work on serverless platforms (Vercel Functions, Cloudflare Workers, AWS Lambda). The ",[703,867,868],{"href":500},"stream page"," explains the constraint in detail.",[619,871,872,873,875,876,875,879,875,882,875,885,875,888,875,891,875,894,897],{},"Everything else, from ",[703,874,513],{"href":514},", ",[703,877,878],{"href":523},"plugins",[703,880,881],{"href":527},"custom enrichers",[703,883,884],{"href":531},"tail sampling",[703,886,887],{"href":535},"identity headers",[703,889,890],{"href":540},"custom drains",[703,892,893],{"href":545},"drain pipeline",[703,895,896],{"href":505},"custom framework integration",", runs everywhere evlog runs.",{"title":652,"searchDepth":899,"depth":899,"links":900},2,[901,902,908],{"id":643,"depth":899,"text":644},{"id":657,"depth":899,"text":658,"children":903},[904,906,907],{"id":662,"depth":905,"text":663},3,{"id":739,"depth":905,"text":740},{"id":806,"depth":905,"text":807},{"id":853,"depth":899,"text":854},"Observe what flows through the pipeline, plug into it, or build your own bricks. The map of every extension point evlog exposes.","md",[912,916,917],{"label":499,"icon":913,"to":500,"color":914,"variant":915},"i-lucide-radio","neutral","subtle",{"label":522,"icon":497,"to":523,"color":914,"variant":915},{"label":918,"icon":542,"to":540,"color":914,"variant":915},"Custom Drains",{},{"title":41,"icon":497},{"title":614,"description":909},"V_xDrKj8z8Ae6zV4vG6-iM5Kremy5pcLHNHZIqRw0Ss",[924,926],{"title":425,"path":486,"stem":487,"description":925,"icon":488,"children":-1},"Three signals to start with, then nine more to copy: failures explained, 200s that lied, agent turns, audit actions, flaky jobs.",{"title":499,"path":500,"stem":501,"description":927,"icon":502,"children":-1},"Subscribe to wide events flowing through evlog — in-process with createStreamDrain, or over the network with the local SSE stream server.",1791657891138]