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Start a migration by preserving those decisions.",[577,578,580],"h2",{"id":579},"identify-what-the-configuration-already-does","Identify what the configuration already does",[573,582,583,584,588,589,592,593,600],{},"Winston composes formats through ",[585,586,587],"code",{},"logform",", supports custom levels, and configures multiple transports with their own levels. It also offers child loggers, profiling, and exception\u002Frejection handlers. JSON output is available through ",[585,590,591],{},"format.json()",". These are reasons to retain it when the pipeline already works. See the ",[594,595,599],"a",{"href":596,"rel":597},"https:\u002F\u002Fgithub.com\u002Fwinstonjs\u002Fwinston",[598],"nofollow","Winston documentation",".",[602,603,604,617],"table",{},[605,606,607],"thead",{},[608,609,610,614],"tr",{},[611,612,613],"th",{},"Existing requirement",[611,615,616],{},"What to check in evlog",[618,619,620,629,637,645,653],"tbody",{},[608,621,622,626],{},[623,624,625],"td",{},"Custom levels",[623,627,628],{},"Map them to four severities and update queries or alerts that depend on the original values.",[608,630,631,634],{},[623,632,633],{},"Format chain",[623,635,636],{},"Decide which transformations become context fields, plugin hooks, or drain serialization.",[608,638,639,642],{},[623,640,641],{},"Custom transport",[623,643,644],{},"Find a matching drain or port the protocol and delivery behavior.",[608,646,647,650],{},[623,648,649],{},"Per-transport level",[623,651,652],{},"Preserve destination-specific filtering explicitly in the delivery configuration.",[608,654,655,658],{},[623,656,657],{},"Exception\u002Frejection handler",[623,659,660],{},"Keep process-level failure handling separate from an individual request's error event.",[577,662,664],{"id":663},"decide-who-assembles-the-final-event","Decide who assembles the final event",[573,666,667,668,671,672,675,676,679],{},"Winston can log a completed object once. The application decides how to collect it. evlog's ",[585,669,670],{},"createLogger()"," provides that accumulator, ",[585,673,674],{},"set()"," adds context, and ",[585,677,678],{},"emit()"," produces the final event. Framework integrations manage that operation lifecycle.",[573,681,682,683,685],{},"Use ",[594,684,46],{"href":47}," to decide whether this model removes code from your handlers. It does not automatically preserve a Winston output schema, and changing several records into one may require new dashboard queries.",[577,687,689],{"id":688},"migrate-with-observable-checkpoints","Migrate with observable checkpoints",[573,691,692,693,696],{},"Choose one operation and document the output fields consumers require. Configure an evlog ",[594,694,695],{"href":148},"drain adapter",", then exercise success and failure against a test destination. Confirm that redaction, severity mapping, retries, and process shutdown meet the same requirements as the existing path.",[573,698,699,700,703],{},"Keep Winston when format composition or custom transports already solve the problem. Consider evlog when accumulated context, structured errors, and its integration lifecycle reduce application code. Neither a library's age nor unequal-output benchmarks establish which is better for your workload. The ",[594,701,702],{"href":517},"Performance reference"," explains the measurements to compare.",[573,705,706,707,710],{},"Use the ",[594,708,709],{"href":530},"logger overview"," to compare the other options before expanding a migration.",{"title":712,"searchDepth":713,"depth":713,"links":714},"",2,[715,716,717],{"id":579,"depth":713,"text":580},{"id":663,"depth":713,"text":664},{"id":688,"depth":713,"text":689},"Compare Winston formats, transports, and custom levels with evlog event accumulation before migrating an existing application.","md",[721],{"label":722,"icon":532,"to":530,"color":723,"variant":724},"Logger overview","neutral","subtle",{},{"icon":532},{"title":560,"description":718},"wYZxB0q4-1bnz_UamuV92YK7vOKEOgM_5Kmsfz28dwg",[730,732],{"title":556,"path":557,"stem":558,"description":731,"icon":532,"children":-1},"Compare LogTape categories, application-owned configuration, context propagation, and testing with evlog request events.",{"title":564,"path":565,"stem":566,"description":733,"icon":532,"children":-1},"Keep Consola for terminal interaction or custom reporters, and evaluate evlog when your application needs accumulated request events.",1788901586800]