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You can ",[613,614,615],"strong",{},"observe"," what flows through (without altering the pipeline), ",[613,618,619],{},"plug into"," the pipeline (enrich, decide what to keep, react to lifecycle events), or ",[613,622,623],{},"build your own bricks"," (custom drains for unsupported destinations, your own framework integration). Each page in this section ships with a ",[626,627,628],"code",{},"::prompt"," block you can drop into Cursor \u002F Claude to scaffold the integration in your own app.",[631,632,634],"h2",{"id":633},"mental-model","Mental model",[636,637,643],"pre",{"className":638,"code":640,"language":641,"meta":642},[639],"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","",[626,644,640],{"__ignoreMap":642},[631,646,648],{"id":647},"three-ways-to-extend","Three ways to extend",[650,651,653],"h3",{"id":652},"observe-the-pipeline-no-mutation","Observe the pipeline (no mutation)",[609,655,656,657,660,661,664],{},"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 ",[626,658,659],{},"curl"," + ",[626,662,663],{},"jq",".",[666,667,668,681],"table",{},[669,670,671],"thead",{},[672,673,674,678],"tr",{},[675,676,677],"th",{},"You want to…",[675,679,680],{},"Use",[682,683,684,695,704,718],"tbody",{},[672,685,686,690],{},[687,688,689],"td",{},"Subscribe to live events (in-process or over SSE for browsers \u002F CLIs)",[687,691,692],{},[693,694,489],"a",{"href":490},[672,696,697,700],{},[687,698,699],{},"Replay or tail historic events from disk",[687,701,702],{},[693,703,503],{"href":504},[672,705,706,713],{},[687,707,708,709,660,711],{},"Build a small consumer panel, devtool, or pipe to ",[626,710,659],{},[626,712,663],{},[687,714,715],{},[693,716,717],{"href":508},"Consumer recipes",[672,719,720,723],{},[687,721,722],{},"Let a consumer subscribe without importing evlog, or reach a Cloudflare Tail Worker",[687,724,725],{},[693,726,499],{"href":500},[650,728,730],{"id":729},"plug-into-the-pipeline","Plug into the pipeline",[609,732,733,734,737],{},"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 ",[626,735,736],{},"definePlugin"," when you have several.",[666,739,740,748],{},[669,741,742],{},[672,743,744,746],{},[675,745,677],{},[675,747,680],{},[682,749,750,759,768,777],{},[672,751,752,755],{},[687,753,754],{},"React to lifecycle events from a single cohesive object (multiple hooks share state)",[687,756,757],{},[693,758,512],{"href":513},[672,760,761,764],{},[687,762,763],{},"Add a derived field on every event automatically",[687,765,766],{},[693,767,516],{"href":517},[672,769,770,773],{},[687,771,772],{},"Decide post-hoc whether to keep an event (status, duration, custom logic)",[687,774,775],{},[693,776,520],{"href":521},[672,778,779,790],{},[687,780,781,782,785,786,789],{},"Identify your evlog traffic on the receiver side (override ",[626,783,784],{},"User-Agent"," \u002F ",[626,787,788],{},"X-Evlog-Source",")",[687,791,792],{},[693,793,524],{"href":525},[650,795,797],{"id":796},"build-your-own-bricks","Build your own bricks",[609,799,800],{},"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.",[666,802,803,811],{},[669,804,805],{},[672,806,807,809],{},[675,808,677],{},[675,810,680],{},[682,812,813,822,831],{},[672,814,815,818],{},[687,816,817],{},"Ship events to a backend without a built-in adapter (HTTP or any other transport)",[687,819,820],{},[693,821,529],{"href":530},[672,823,824,827],{},[687,825,826],{},"Wrap any drain in batch + retry + fanout for production",[687,828,829],{},[693,830,534],{"href":535},[672,832,833,836],{},[687,834,835],{},"Support a framework that's not in the list, or a non-HTTP runtime",[687,837,838],{},[693,839,840],{"href":495},"Custom framework integration",[631,842,844],{"id":843},"what-works-where","What works where",[609,846,847,848,851,852,855,856,859],{},"Only the ",[693,849,850],{"href":490},"stream"," (in-process bus + SSE bridge) is ",[613,853,854],{},"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 ",[693,857,858],{"href":490},"stream page"," explains the constraint in detail.",[609,861,862,863,865,866,865,869,865,872,865,875,865,878,865,881,865,884,887],{},"Everything else, from ",[693,864,503],{"href":504},", ",[693,867,868],{"href":513},"plugins",[693,870,871],{"href":517},"custom enrichers",[693,873,874],{"href":521},"tail sampling",[693,876,877],{"href":525},"identity headers",[693,879,880],{"href":530},"custom drains",[693,882,883],{"href":535},"drain pipeline",[693,885,886],{"href":495},"custom framework integration",", runs everywhere evlog runs.",{"title":642,"searchDepth":889,"depth":889,"links":890},2,[891,892,898],{"id":633,"depth":889,"text":634},{"id":647,"depth":889,"text":648,"children":893},[894,896,897],{"id":652,"depth":895,"text":653},3,{"id":729,"depth":895,"text":730},{"id":796,"depth":895,"text":797},{"id":843,"depth":889,"text":844},"Observe what flows through the pipeline, plug into it, or build your own bricks. The map of every extension point evlog exposes.","md",[902,906,907],{"label":489,"icon":903,"to":490,"color":904,"variant":905},"i-lucide-radio","neutral","subtle",{"label":512,"icon":487,"to":513,"color":904,"variant":905},{"label":908,"icon":532,"to":530,"color":904,"variant":905},"Custom Drains",{},{"title":41,"icon":487},{"title":604,"description":899},"V_xDrKj8z8Ae6zV4vG6-iM5Kremy5pcLHNHZIqRw0Ss",[914,916],{"title":415,"path":476,"stem":477,"description":915,"icon":478,"children":-1},"Three signals to start with, then nine more to copy: failures explained, 200s that lied, agent turns, audit actions, flaky jobs.",{"title":489,"path":490,"stem":491,"description":917,"icon":492,"children":-1},"Subscribe to wide events flowing through evlog — in-process with createStreamDrain, or over the network with the local SSE stream server.",1791060982357]