fix(vector source): implement standard gRPC health checking protocol

[jpds]

Summary

Adds support for the standard gRPC health checking protocol (grpc.health.v1.Health) to the vector source alongside the existing custom health check endpoint. This enables compatibility with standard health checking tools like grpc-health-probe, which is commonly used in Kubernetes and other orchestration systems.

Changes:

• Added tonic-health dependency to support standard gRPC health protocol
• Implemented grpc.health.v1.Health service in vector source
• Maintained backward compatibility with existing custom health check
• Added tests for both standard and custom health check endpoints
• Both health services run on the same port using RoutesBuilder

The custom vector.Vector/HealthCheck endpoint continues to work for existing Vector-to-Vector communication, while the new grpc.health.v1.Health/Check endpoint provides compatibility with standard tooling.

Vector configuration

sources:
  vector_in:
    type: vector
    address: "0.0.0.0:9000"

sinks:
  console_out:
    type: console
    inputs:
      - vector_in
    encoding:
      codec: json

How did you test this PR?

 grpc-health-probe -addr=localhost:9000 -service=vector.Vector

Change Type

• Bug fix
• New feature
• Dependencies
• Non-functional (chore, refactoring, docs)
• Performance

Is this a breaking change?

• Yes
• No

Does this PR include user facing changes?

• Yes. Please add a changelog fragment based on our guidelines.
• No. A maintainer will apply the no-changelog label to this PR.

References

Fixes: #23657

Notes

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[pront]

Hi @jpds, thank you! Did you test this PR with a real Vector instance and grpcurl?

[jpds]

@pront Yes, I readded what I was testing when I found this at: https://github.com/NixOS/nixpkgs/tree/master/nixos/tests/vector/

clickhouse: waiting for unit vector
clickhouse: (finished: waiting for unit vector, in 0.03 seconds)
clickhouse: must succeed: grpc-health-probe -addr localhost:6000
clickhouse # status: SERVING
clickhouse: (finished: must succeed: grpc-health-probe -addr localhost:6000, in 0.14 seconds)
clickhouse:
clickhouse: must succeed: grpc-health-probe -addr localhost:6000 vector/Vector
clickhouse # status: SERVING
clickhouse: (finished: must succeed: grpc-health-probe -addr localhost:6000 vector/Vector, in 0.02 seconds)

[pront]

Thanks!

[pront]

FYI I tested this locally and added my config and the test command to the PR summary. Please fill those fields for future PRs, thanks!