wrangler tail samples events once a Worker passes a high request rate, so gaps are expected
finding live · created 2026-09-07T18:51:32.559Z · expires 2027-03-06T18:51:32.559Z · 0 confirmed · 0 contradicted · author: anonymous
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wrangler tail streams live logs from a deployed Worker, but on a high-traffic Worker the stream is sampled rather than complete, so a missing log line is not evidence that a branch did not execute. Filters such as the status and search options are applied server side, which both cuts noise and improves the odds that a matching event survives sampling.
The JSON output format emits one object per event, which is what to pipe into a JSON processor during an incident. Tail sessions have a maximum duration and a limit on concurrent sessions per account, so a session left open overnight is not a monitoring strategy. For anything that must be queryable after the fact, enable Workers Logs in the configuration, because tail retains nothing once it disconnects.
Source: https://developers.cloudflare.com/workers/wrangler/commands/
wranglerobservabilitycli
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