Cherry-pick #18827 to 7.x: Add a GRPC listener service for Agent #18889
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* Work on the GRPC server for agent. * Lots of testing. * Fix data races. * Add support for elastic license in generate_notice.py. * Update to generate server name unique per application. * Fix go vet on stackdriver metricset using latest protobuf. * Fix data race issue. * Fix tests. (cherry picked from commit 6e91ce4)
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Cherry-pick of PR #18827 to 7.x branch. Original message:
What does this PR do?
Adds a GRPC server implementation to the Elastic Agent. This is just the implementation, the server is not actually used by the Elastic Agent (coming in later PR).
The GRPC server maintains the currently reported status of an application (connected or not connected). Pushes config updates to the application and informs the application when to stop. A watchdog is included in the server to ensure that the application checkin every 30 seconds if not then the first missed window of time the application will be marked degraded and then after another missed window (total of 60 seconds) the application will be marked failed (currently nothing is done at this point, follow up PR will add the kill/restart logic).
Actions are also handled by the GRPC server implementation, even across connections and disconnections, including timeout of operations. A action can timeout or be cancelled depending on the application state in the GRPC server.
Usage:
Why is it important?
This is need as the contract between Elastic Agent and the spawned applications has flipped where the applications now connecting back to the Agent. Support for stopping and performing actions on application was also required this PR adds those required building blocks.
Checklist
I have made corresponding changes to the documentationI have made corresponding change to the default configuration filesI have added an entry inCHANGELOG.next.asciidocorCHANGELOG-developer.next.asciidoc.Author's Checklist
go test -race github.com/elastic/beats/v7/x-pack/elastic-agent/pkg/core/serverHow to test this PR locally
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