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The four pages below cover the entire extension surface — pick one when you have a single concern, pick ",[448,548,549],{},"definePlugin"," when you have several.",[488,552,553,561],{},[491,554,555],{},[494,556,557,559],{},[497,558,499],{},[497,560,502],{},[504,562,563,572,581,590],{},[494,564,565,568],{},[509,566,567],{},"React to lifecycle events from a single cohesive object (multiple hooks share state)",[509,569,570],{},[515,571,367],{"href":368},[494,573,574,577],{},[509,575,576],{},"Add a derived field on every event automatically",[509,578,579],{},[515,580,371],{"href":372},[494,582,583,586],{},[509,584,585],{},"Decide post-hoc whether to keep an event (status, duration, custom logic)",[509,587,588],{},[515,589,375],{"href":376},[494,591,592,603],{},[509,593,594,595,598,599,602],{},"Identify your evlog traffic on the receiver side (override ",[448,596,597],{},"User-Agent"," \u002F ",[448,600,601],{},"X-Evlog-Source",")",[509,604,605],{},[515,606,379],{"href":380},[472,608,610],{"id":609},"build-your-own-bricks","Build your own bricks",[431,612,613],{},"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.",[488,615,616,624],{},[491,617,618],{},[494,619,620,622],{},[497,621,499],{},[497,623,502],{},[504,625,626,635,644],{},[494,627,628,631],{},[509,629,630],{},"Ship events to a backend without a built-in adapter (HTTP or any other transport)",[509,632,633],{},[515,634,384],{"href":385},[494,636,637,640],{},[509,638,639],{},"Wrap any drain in batch + retry + fanout for production",[509,641,642],{},[515,643,389],{"href":390},[494,645,646,649],{},[509,647,648],{},"Support a framework that's not in the list, or a non-HTTP runtime",[509,650,651],{},[515,652,653],{"href":354},"Custom framework integration",[453,655,657],{"id":656},"what-works-where","What works where",[431,659,660,661,664,665,668,669,672],{},"Only the ",[515,662,663],{"href":349},"stream"," (in-process bus + SSE bridge) is ",[435,666,667],{},"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 ",[515,670,671],{"href":349},"stream page"," explains the constraint in detail.",[431,674,675,676,678,679,678,682,678,685,678,688,678,691,678,694,678,697,700],{},"Everything else — ",[515,677,358],{"href":359},", ",[515,680,681],{"href":368},"plugins",[515,683,684],{"href":372},"custom enrichers",[515,686,687],{"href":376},"tail sampling",[515,689,690],{"href":380},"identity headers",[515,692,693],{"href":385},"custom drains",[515,695,696],{"href":390},"drain pipeline",[515,698,699],{"href":354},"custom framework integration"," — runs everywhere evlog runs.",{"title":464,"searchDepth":702,"depth":702,"links":703},2,[704,705,711],{"id":455,"depth":702,"text":456},{"id":469,"depth":702,"text":470,"children":706},[707,709,710],{"id":474,"depth":708,"text":475},3,{"id":542,"depth":708,"text":543},{"id":609,"depth":708,"text":610},{"id":656,"depth":702,"text":657},"Observe what flows through the pipeline (stream, fs reader, consumer recipes), plug into the pipeline (plugins, enrichers, tail sampling, identity headers), or build your own bricks (custom drains, drain pipeline, custom framework integration).","md",[715,719,720],{"label":348,"icon":716,"to":349,"color":717,"variant":718},"i-lucide-radio","neutral","subtle",{"label":367,"icon":346,"to":368,"color":717,"variant":718},{"label":721,"icon":387,"to":385,"color":717,"variant":718},"Custom Drains",{},{"title":31,"icon":346},{"title":426,"description":712},"UFsHTTCjOxuqTwfefjSnTrUy54MvAEdb9ivFjKPW6E0",[727,729],{"title":334,"path":335,"stem":336,"description":728,"icon":337,"children":-1},"Add derived context to every wide event automatically — user agent, geo, request size, and trace context. Built-in enrichers from evlog\u002Fenrichers, plus how to compose them with your own.",{"title":348,"path":349,"stem":350,"description":730,"icon":351,"children":-1},"Subscribe to wide events flowing through evlog — in-process with createStreamDrain, or over the network with the local SSE stream server.",1778360825215]