Missing Envoy Adaptive Concurrency Metric

[devoant]

Envoy Adaptive Concurrency Metrics are not currently being mapped in the metrics.py for envoy.

Example of metrics emitted

http.ingress-https.adaptive_concurrency.gradient_controller.burst_queue_size: 22
http.ingress-https.adaptive_concurrency.gradient_controller.concurrency_limit: 30
http.ingress-https.adaptive_concurrency.gradient_controller.gradient: 0
http.ingress-https.adaptive_concurrency.gradient_controller.min_rtt_calculation_active: 1
http.ingress-https.adaptive_concurrency.gradient_controller.min_rtt_msecs: 1
http.ingress-https.adaptive_concurrency.gradient_controller.sample_rtt_msecs: 1

Envoy Doc: Adaptive Concurrency

This is critical to keep track of gradient calculation and buffer growth during traffic testing.