In multiple places we use a on_update callback set properly set server parameter, and we rely on Client::getcurrent() to do so. In many of those places, we simply perform a noop in the case the current thread does not have a client.

In the case we don't have a client, we should consider adding a warning log so that calling those function on threads without client don't go completely silent. This should help diagnosing and debugging when setting a server parameter don't behave as expected.

The places we can observe this includes, but it not limited to:

• ShardSharedStateCache
• IngressRequestRateLimiter
• IngressAdmissionController