Implement ingester graceful shutdown #4117
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fulmicoton
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Description
Add a
DecommissionRPC to ingesters. By default, ingesters are inReadystatus. Upon receiving a decommissioning request, ingesters change their status toDecommissioning, close all their shards, become read-only and wait for them to be indexed by monitoring calls totruncate. When the indexing of all the shards is completed, ingesters transition to theDecommissionedstatus at which point they become safe to shut down.I also added a
OpenObservationStreamRPC to ingesters, so we can track the status of the decommissioning process. In the future, we can enrich theObservationMessageobject to track more things.How was this PR tested?