Apoorv Mittal created KAFKA-17577:
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Summary: May be record metrics on UnknownSubscriptionIdException
Key: KAFKA-17577
URL: https://issues.apache.org/jira/browse/KAFKA-17577
Project: Kafka
Issue Type: Sub-task
Reporter: Apoorv Mittal
Assignee: Apoorv Mittal
h3. Handling {{UnknownSubscriptionIdException}} (USIE)
When a broker changes telemetry subscriptions and a client attempts to report
metrics with an outdated subscription ID, the broker throws
{{UnknownSubscriptionIdException}} (USIE). In this case, the metrics payload is
discarded, leading to a potential data gap.
If the client is using delta temporality (incremental metrics), this gap is
reflected in external monitoring systems, which will observe a dip, potentially
treating the next set of metrics as a new starting point. This can mislead
monitoring systems and create inaccuracies.
The client should continue to work, as currently, by invoking
{{GetTelemetrySubscriptionsRequest}} to renew the metrics subscription when
broker throws {{{}USIE{}}}. However, the broker will record the telemetry
metrics by validating the last subscription ID, reducing the chance of data
gaps.
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