Backport of events: Remove subscriptions on timeout and cancel into release/1.13.x #19204
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swenson
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Feb 15, 2023
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Backport
This PR is auto-generated from #19185 to be assessed for backporting due to the inclusion of the label backport/1.13.x.
The below text is copied from the body of the original PR.
When subscriptions are too slow to accept messages on their channels, then we should remove them from the fanout so that we don't have dead subscriptions using up resources.
In addition, when a subscription is explicitly canceled, we should also clean up after it remove the corresponding pipeline.
We also add a new metrics,
events.subscriptions, to keep track of the number of active subscriptions. This also helps us test.Overview of commits