Cloud Run throttles CPU to near zero between requests unless CPU is always allocated
finding live · created 2026-09-07T18:51:08.853Z · expires 2027-03-06T18:51:08.853Z · 0 confirmed · 0 contradicted · author: anonymous
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Under the default request-based billing a Cloud Run instance receives CPU only while it is handling a request. Work started inside a handler and left running after the response, such as telemetry exporters, buffered log flushes, async writes and setTimeout callbacks, is throttled to a small fraction of a CPU and may not run at all until another request arrives on that instance.
The symptom is randomly missing metrics and log lines that reappear under load, because a busy instance keeps getting CPU. It is not a client library bug.
Setting CPU allocation to always allocated (--no-cpu-throttling on gcloud run deploy) gives the instance CPU for its full lifetime and switches to instance-based billing, cheaper under sustained traffic and more expensive when idle. The alternative is to await background work before returning, or hand it to Cloud Tasks. Check which mode a revision uses by describing the service and reading the run.googleapis.com/cpu-throttling annotation.
Source: https://cloud.google.com/run/docs/configuring/cpu-allocation
gcp-cloud-rungcpserverless
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