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Start a migration by preserving those decisions.",[586,587,589],"h2",{"id":588},"identify-what-the-configuration-already-does","Identify what the configuration already does",[582,591,592,593,597,598,601,602,609],{},"Winston composes formats through ",[594,595,596],"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 ",[594,599,600],{},"format.json()",". These are reasons to retain it when the pipeline already works. See the ",[603,604,608],"a",{"href":605,"rel":606},"https:\u002F\u002Fgithub.com\u002Fwinstonjs\u002Fwinston",[607],"nofollow","Winston documentation",".",[611,612,613,626],"table",{},[614,615,616],"thead",{},[617,618,619,623],"tr",{},[620,621,622],"th",{},"Existing requirement",[620,624,625],{},"What to check in evlog",[627,628,629,638,646,654,662],"tbody",{},[617,630,631,635],{},[632,633,634],"td",{},"Custom levels",[632,636,637],{},"Map them to four severities and update queries or alerts that depend on the original values.",[617,639,640,643],{},[632,641,642],{},"Format chain",[632,644,645],{},"Decide which transformations become context fields, plugin hooks, or drain serialization.",[617,647,648,651],{},[632,649,650],{},"Custom transport",[632,652,653],{},"Find a matching drain or port the protocol and delivery behavior.",[617,655,656,659],{},[632,657,658],{},"Per-transport level",[632,660,661],{},"Preserve destination-specific filtering explicitly in the delivery configuration.",[617,663,664,667],{},[632,665,666],{},"Exception\u002Frejection handler",[632,668,669],{},"Keep process-level failure handling separate from an individual request's error event.",[586,671,673],{"id":672},"decide-who-assembles-the-final-event","Decide who assembles the final event",[582,675,676,677,680,681,684,685,688],{},"Winston can log a completed object once. The application decides how to collect it. evlog's ",[594,678,679],{},"createLogger()"," provides that accumulator, ",[594,682,683],{},"set()"," adds context, and ",[594,686,687],{},"emit()"," produces the final event. Framework integrations manage that operation lifecycle.",[582,690,691,692,694],{},"Use ",[603,693,51],{"href":52}," 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.",[586,696,698],{"id":697},"migrate-with-observable-checkpoints","Migrate with observable checkpoints",[582,700,701,702,705],{},"Choose one operation and document the output fields consumers require. Configure an evlog ",[603,703,704],{"href":153},"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.",[582,707,708,709,712],{},"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 ",[603,710,711],{"href":526},"Performance reference"," explains the measurements to compare.",[582,714,715,716,719],{},"Use the ",[603,717,718],{"href":539},"logger overview"," to compare the other options before expanding a migration.",{"title":721,"searchDepth":722,"depth":722,"links":723},"",2,[724,725,726],{"id":588,"depth":722,"text":589},{"id":672,"depth":722,"text":673},{"id":697,"depth":722,"text":698},"Compare Winston formats, transports, and custom levels with evlog event accumulation before migrating an existing application.","md",[730],{"label":731,"icon":541,"to":539,"color":732,"variant":733},"Logger overview","neutral","subtle",{},{"icon":541},{"title":569,"description":727},"wYZxB0q4-1bnz_UamuV92YK7vOKEOgM_5Kmsfz28dwg",[739,741],{"title":565,"path":566,"stem":567,"description":740,"icon":541,"children":-1},"Compare LogTape categories, application-owned configuration, context propagation, and testing with evlog request events.",{"title":573,"path":574,"stem":575,"description":742,"icon":541,"children":-1},"Keep Consola for terminal interaction or custom reporters, and evaluate evlog when your application needs accumulated request events.",1789317481097]