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OpenTelemetry","\u002Fcompare\u002Fopentelemetry","8.compare\u002F2.opentelemetry",{"title":596,"path":597,"stem":598,"icon":572},"evlog vs LogTape","\u002Fcompare\u002Flogtape","8.compare\u002F3.logtape",{"title":600,"path":601,"stem":602,"icon":572},"evlog vs Winston: formats and request events","\u002Fcompare\u002Fwinston","8.compare\u002F4.winston",{"title":604,"path":605,"stem":606,"icon":572},"evlog vs Consola: reporters and request context","\u002Fcompare\u002Fconsola","8.compare\u002F5.consola",{"id":608,"title":609,"body":610,"description":904,"extension":905,"links":906,"meta":914,"navigation":915,"path":490,"seo":916,"stem":491,"__hash__":917},"docs\u002F6.extend\u002F0.overview.md","Extend evlog",{"type":611,"value":612,"toc":893},"minimark",[613,635,640,650,654,659,670,732,736,743,799,803,806,846,850,865],[614,615,616,617,621,622,625,626,629,630,634],"p",{},"evlog is designed to be extended on both ends. You can ",[618,619,620],"strong",{},"observe"," what flows through (without altering the pipeline), ",[618,623,624],{},"plug into"," the pipeline (enrich, decide what to keep, react to lifecycle events), or ",[618,627,628],{},"build your own bricks"," (custom drains for unsupported destinations, your own framework integration). Each page in this section ships with a ",[631,632,633],"code",{},"::prompt"," block you can drop into Cursor \u002F Claude to scaffold the integration in your own app.",[636,637,639],"h2",{"id":638},"mental-model","Mental model",[641,642,648],"pre",{"className":643,"code":645,"language":646,"meta":647},[644],"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","",[631,649,645],{"__ignoreMap":647},[636,651,653],{"id":652},"three-ways-to-extend","Three ways to extend",[655,656,658],"h3",{"id":657},"observe-the-pipeline-no-mutation","Observe the pipeline (no mutation)",[614,660,661,662,665,666,669],{},"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 ",[631,663,664],{},"curl"," + ",[631,667,668],{},"jq",".",[671,672,673,686],"table",{},[674,675,676],"thead",{},[677,678,679,683],"tr",{},[680,681,682],"th",{},"You want to…",[680,684,685],{},"Use",[687,688,689,700,709,723],"tbody",{},[677,690,691,695],{},[692,693,694],"td",{},"Subscribe to live events (in-process or over SSE for browsers \u002F CLIs)",[692,696,697],{},[698,699,494],"a",{"href":495},[677,701,702,705],{},[692,703,704],{},"Replay or tail historic events from disk",[692,706,707],{},[698,708,508],{"href":509},[677,710,711,718],{},[692,712,713,714,665,716],{},"Build a small consumer panel, devtool, or pipe to ",[631,715,664],{},[631,717,668],{},[692,719,720],{},[698,721,722],{"href":513},"Consumer recipes",[677,724,725,728],{},[692,726,727],{},"Let a consumer subscribe without importing evlog, or reach a Cloudflare Tail Worker",[692,729,730],{},[698,731,504],{"href":505},[655,733,735],{"id":734},"plug-into-the-pipeline","Plug into the pipeline",[614,737,738,739,742],{},"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 ",[631,740,741],{},"definePlugin"," when you have several.",[671,744,745,753],{},[674,746,747],{},[677,748,749,751],{},[680,750,682],{},[680,752,685],{},[687,754,755,764,773,782],{},[677,756,757,760],{},[692,758,759],{},"React to lifecycle events from a single cohesive object (multiple hooks share state)",[692,761,762],{},[698,763,517],{"href":518},[677,765,766,769],{},[692,767,768],{},"Add a derived field on every event automatically",[692,770,771],{},[698,772,521],{"href":522},[677,774,775,778],{},[692,776,777],{},"Decide post-hoc whether to keep an event (status, duration, custom logic)",[692,779,780],{},[698,781,525],{"href":526},[677,783,784,795],{},[692,785,786,787,790,791,794],{},"Identify your evlog traffic on the receiver side (override ",[631,788,789],{},"User-Agent"," \u002F ",[631,792,793],{},"X-Evlog-Source",")",[692,796,797],{},[698,798,529],{"href":530},[655,800,802],{"id":801},"build-your-own-bricks","Build your own bricks",[614,804,805],{},"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.",[671,807,808,816],{},[674,809,810],{},[677,811,812,814],{},[680,813,682],{},[680,815,685],{},[687,817,818,827,836],{},[677,819,820,823],{},[692,821,822],{},"Ship events to a backend without a built-in adapter (HTTP or any other transport)",[692,824,825],{},[698,826,534],{"href":535},[677,828,829,832],{},[692,830,831],{},"Wrap any drain in batch + retry + fanout for production",[692,833,834],{},[698,835,539],{"href":540},[677,837,838,841],{},[692,839,840],{},"Support a framework that's not in the list, or a non-HTTP runtime",[692,842,843],{},[698,844,845],{"href":500},"Custom framework integration",[636,847,849],{"id":848},"what-works-where","What works where",[614,851,852,853,856,857,860,861,864],{},"Only the ",[698,854,855],{"href":495},"stream"," (in-process bus + SSE bridge) is ",[618,858,859],{},"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 ",[698,862,863],{"href":495},"stream page"," explains the constraint in detail.",[614,866,867,868,870,871,870,874,870,877,870,880,870,883,870,886,870,889,892],{},"Everything else, from ",[698,869,508],{"href":509},", ",[698,872,873],{"href":518},"plugins",[698,875,876],{"href":522},"custom enrichers",[698,878,879],{"href":526},"tail sampling",[698,881,882],{"href":530},"identity headers",[698,884,885],{"href":535},"custom drains",[698,887,888],{"href":540},"drain pipeline",[698,890,891],{"href":500},"custom framework integration",", runs everywhere evlog runs.",{"title":647,"searchDepth":894,"depth":894,"links":895},2,[896,897,903],{"id":638,"depth":894,"text":639},{"id":652,"depth":894,"text":653,"children":898},[899,901,902],{"id":657,"depth":900,"text":658},3,{"id":734,"depth":900,"text":735},{"id":801,"depth":900,"text":802},{"id":848,"depth":894,"text":849},"Observe what flows through the pipeline, plug into it, or build your own bricks. The map of every extension point evlog exposes.","md",[907,911,912],{"label":494,"icon":908,"to":495,"color":909,"variant":910},"i-lucide-radio","neutral","subtle",{"label":517,"icon":492,"to":518,"color":909,"variant":910},{"label":913,"icon":537,"to":535,"color":909,"variant":910},"Custom Drains",{},{"title":41,"icon":492},{"title":609,"description":904},"V_xDrKj8z8Ae6zV4vG6-iM5Kremy5pcLHNHZIqRw0Ss",[919,921],{"title":420,"path":481,"stem":482,"description":920,"icon":483,"children":-1},"Three signals to start with, then nine more to copy: failures explained, 200s that lied, agent turns, audit actions, flaky jobs.",{"title":494,"path":495,"stem":496,"description":922,"icon":497,"children":-1},"Subscribe to wide events flowing through evlog — in-process with createStreamDrain, or over the network with the local SSE stream server.",1791444198651]