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You extend it when you want to ",[558,568,569],{},"transform",", ",[558,572,573],{},"enrich",[558,575,576],{},"drop",", or ",[558,579,580],{},"react"," to events as they flow.",[554,583,584,585,570,589,570,592,595,596,599],{},"Built-in pipeline behavior covers ",[586,587,588],"a",{"href":176},"head and tail sampling",[586,590,591],{"href":198},"redaction",[586,593,594],{"href":541},"built-in enrichers",", and the ",[586,597,598],{"href":416},"drain pipeline",".",[601,602,604],"h2",{"id":603},"pages-here","Pages here",[606,607,608,623],"table",{},[609,610,611],"thead",{},[612,613,614,617,620],"tr",{},[615,616],"th",{},[615,618,619],{},"What",[615,621,622],{},"When",[624,625,626,642,657],"tbody",{},[612,627,628,633,639],{},[629,630,631],"td",{},[586,632,335],{"href":336},[629,634,635,638],{},[563,636,637],{},"definePlugin()"," — opt into any subset of the lifecycle hooks",[629,640,641],{},"You need to mix several behaviors (enrich + drain + tail-sampling) for one cohesive feature",[612,643,644,648,654],{},[629,645,646],{},[586,647,339],{"href":340},[629,649,650,653],{},[563,651,652],{},"defineEnricher()"," — derive context from request headers, env, etc.",[629,655,656],{},"You want to add a field on every event without touching every call site",[612,658,659,663,666],{},[629,660,661],{},[586,662,343],{"href":344},[629,664,665],{},"Decide post-hoc whether an event is kept based on the request outcome",[629,667,668],{},"You want to keep all errors \u002F slow requests and drop the rest",[601,670,672],{"id":671},"mental-model","Mental model",[674,675,681],"pre",{"className":676,"code":678,"language":679,"meta":680},[677],"language-text","   emit                       enrich                     keep?                     drain(s)\n   ─────  ────▶  ────────  ────▶  ──────────  ────▶  ───────────  ────▶  ─────────────\n   log.info()                  enricher hook       tail sampling          drain hook\n                               (enrichers\u002Fplugins) (keep predicate)        (drain\u002Fplugins)\n","text","",[563,682,678],{"__ignoreMap":680},[554,684,685,686,689],{},"Plugins can hook ",[558,687,688],{},"at every step"," through one unified contract, which is why they're the canonical extension point for anything more elaborate than a single-purpose enricher.",[601,691,693],{"id":692},"going-further","Going further",[554,695,696,697,700],{},"If you build something general-purpose, ",[586,698,699],{"href":393},"package it as an enricher npm"," so other projects can reuse it.",{"title":680,"searchDepth":702,"depth":702,"links":703},2,[704,705,706],{"id":603,"depth":702,"text":604},{"id":671,"depth":702,"text":672},{"id":692,"depth":702,"text":693},"The pipeline is everything that happens between an event being emitted and a drain receiving it — plugins, enrichers, sampling, redaction, fork.","md",null,{},{"title":41,"icon":333},{"title":549,"description":707},"-gvaM8bi9EPOtqfessuTmzjVvp5ro8E9-nI-uboPnE0",[715,717],{"title":156,"path":322,"stem":323,"description":716,"icon":324,"children":-1},"Concrete copy-paste recipes — build your own minimal devtool, pipe to curl + jq, replay history then go live, and aggregate on the consumer side.",{"title":335,"path":336,"stem":337,"description":718,"icon":288,"children":-1},"definePlugin is the canonical extension contract for evlog. One plugin can opt into any subset of lifecycle hooks — enrich, drain, tail sampling, request lifecycle, client log observation.",1778338249580]