feat: document circuit breaker config options for targets

[sametd]

Summary

• Document circuit breaker configuration options in the default target definition

Change

Add commented-out circuit_breaker section to values.yaml under the worker_pool target. No template changes needed since targets are passed through via toYaml.

# circuit_breaker:            # Stop sending requests when target is consistently failing
#   failure_threshold: 5      # Consecutive transport failures to trip open (default 5)
#   open_timeout_secs: 30     # Seconds before allowing a probe request (default 30)

Operators uncomment and adjust values to enable per-target circuit breaking. When a target fails failure_threshold times consecutively (connection errors, timeouts, 5xx), the broker stops sending requests for open_timeout_secs, then allows one probe request to test recovery.

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

[Copilot]

Pull request overview

Documents per-target circuit breaker configuration options in the Helm chart’s default broker target definition, making it easier for operators to discover and enable circuit breaking.

Changes:

• Adds a commented-out circuit_breaker block under broker.targets.worker_pool in values.yaml describing available knobs (failure_threshold, open_timeout_secs).

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