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feat(deno): Record request sessions for Deno.serve - #25496
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`denoHttpIntegration` records a request session for each `node:http` request, but `denoServeIntegration` recorded none. Most Deno apps use `Deno.serve`, so release health showed no request sessions and no crash-free rate for them. The shared helper `recordRequestSession` waits for the `close` event of a `node:http` response, which `Deno.serve` does not have. Core now exports `startRequestSession`, which starts the session and returns an `end()` function. `recordRequestSession` keeps its signature and calls `end()` from the `close` event, so Node does not change. The helper now defaults `sessionFlushingDelayMS` to 60 seconds. Before, only core's `node:http` subscription code set that default, and a caller that left the option out got a timer that fired at once. `denoServeIntegration` accepts `sessions` (default `true`) and `sessionFlushingDelayMS`, as `denoHttpIntegration` does. The session ends when the response finishes. For a streamed response, that is when the stream finishes. When the handler throws, the session ends after the SDK captures the error, so it counts as crashed. Sessions do not depend on tracing, so they are also recorded when the SDK skips the span. To match Node, OPTIONS and HEAD requests also record sessions. Fixes #25495 Fixes JS-3956 Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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denoHttpIntegrationrecords a request session for eachnode:httprequest, butdenoServeIntegrationrecorded none. Most Deno apps useDeno.serve, so release health showed no request sessions and no crash-free rate for them.The shared helper
recordRequestSessionwaits for thecloseevent of anode:httpresponse, whichDeno.servedoes not have. Core now exportsstartRequestSession, which starts the session and returns anend()function.recordRequestSessionkeeps its signature and callsend()from thecloseevent, so Node does not change. The helper now defaultssessionFlushingDelayMSto 60 seconds. Before, only core'snode:httpsubscription code set that default, and a caller that left the option out got a timer that fired at once.denoServeIntegrationacceptssessions(defaulttrue) andsessionFlushingDelayMS, asdenoHttpIntegrationdoes. The session ends when the response finishes. For a streamed response, that is when the stream finishes. When the handler throws, the session ends after the SDK captures the error, so it counts as crashed. Sessions do not depend on tracing, so they are also recorded when the SDK skips the span. To match Node, OPTIONS and HEAD requests also record sessions.Fixes #25495
Fixes JS-3956