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feat(metrics): add Prometheus metrics for circuit monitoring

Raghav Khuranarequested to merge
raghavkhurana/erpc:main into main
  • Add metrics for circuit attempts, successes, and failures
  • Expose metrics via HTTP /metrics endpoint on configurable address
  • Include build time measurements and error type categorization
  • Add configuration option for metrics server address (default: 127.0.0.1:9090)
  • Include comprehensive test coverage for metrics collection and HTTP endpoint

This implementation enables real-time monitoring and visualization of circuit creation performance and failure patterns through Prometheus and Grafana.

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