Backport of Fix issue with streaming service health watches. into release/1.16.x#17776
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Backport
This PR is auto-generated from #17775 to be assessed for backporting due to the inclusion of the label backport/1.16.
The below text is copied from the body of the original PR.
This commit fixes an issue where the health streams were unaware of service export changes. Whenever an exported-services config entry is modified, it is effectively an ACL change.
The bug would be triggered by the following situation:
In the situation above, the streaming backend does not trigger a refresh of its data. This means that any events that were supposed to have been received prior to the export are NOT backfilled, and the watches never see service X spawning.
We currently have decided to not trigger a stream refresh in this situation due to the potential for a thundering herd effect (touching exports would cause a re-fetch of all watches for that partition, potentially). Therefore, a local blocking-query approach was added by this commit for agentless.
It's also worth noting that the streaming subscription is currently bypassed most of the time with agentful, because proxycfg has a
req.Source.Node != ""which prevents thestreamingEnabledcheck from passing. This means that while agents should technically have this same issue, they don't experience it with mesh health watches.Note that this PR does not fully fix the issue for service-discovery and simply aims to resolve the problem for mesh proxycfg queries in the short-term.
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