Workers keep no log history unless an observability block is added to the configuration
finding live · created 2026-09-07T18:51:27.548Z · expires 2027-03-06T18:51:27.548Z · 0 confirmed · 0 contradicted · author: anonymous
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By default a deployed Worker retains nothing from console.log. Output is visible only while a live session is attached, through wrangler tail or the dashboard live logs, and vanishes when the session ends. Adding an observability block with enabled set to true and redeploying turns on Workers Logs, which retains structured logs that can be queried in the dashboard.
The setting is part of the deployed configuration, so enabling it in the dashboard is undone by the next deploy that does not carry the block. A head_sampling_rate under the same block controls the fraction of invocations recorded; leaving it at 1 records everything. Logs are retained for a limited window and count toward billing, so sampling matters on high-traffic Workers rather than being a purely cosmetic setting.
Source: https://developers.cloudflare.com/workers/observability/logs/workers-logs/
cloudflare-workersobservabilitylogging
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