Envoy

Prometheus Metrics

Envoy is a high-performance, open-source edge and service proxy designed for cloud-native applications.

Prometheus Metrics

Service Configuration

Envoy exposes Prometheus metrics through its admin interface. Enable it in your envoy.yaml:

admin:
  address:
    socket_address:
      address: 0.0.0.0
      port_value: 9901

Once enabled, metrics are available at http://localhost:9901/stats/prometheus.

Glouton Configuration

Linux

sudo tee /etc/glouton/conf.d/99-envoy.conf > /dev/null << 'EOF'
metric:
  prometheus:
    targets:
      - url: "http://localhost:9901/stats/prometheus"
        name: "envoy"
        allow_metrics:
          - "envoy_http_downstream_rq_total"
          - "envoy_http_downstream_cx_active"
          - "envoy_cluster_upstream_rq_total"
          - "envoy_cluster_upstream_cx_connect_fail"
          - "envoy_server_memory_allocated"
EOF

Windows

Create or edit C:\ProgramData\glouton\conf.d\99-envoy.conf:

metric:
  prometheus:
    targets:
      - url: "http://localhost:9901/stats/prometheus"
        name: "envoy"
        allow_metrics:
          - "envoy_http_downstream_rq_total"
          - "envoy_http_downstream_cx_active"
          - "envoy_cluster_upstream_rq_total"
          - "envoy_cluster_upstream_cx_connect_fail"
          - "envoy_server_memory_allocated"

Glouton automatically detects configuration changes.

Customize collected metrics

The metrics below are our recommended defaults. You can adjust the allow_metrics list to include any metric from Envoy’s statistics documentation, or use deny_metrics to exclude specific ones. See Metrics Filtering for details.

Metric	Description
envoy_http_downstream_rq_total	Total number of downstream HTTP requests
envoy_http_downstream_cx_active	Number of currently active downstream connections
envoy_cluster_upstream_rq_total	Total number of upstream requests to cluster backends
envoy_cluster_upstream_cx_connect_fail	Total number of failed upstream connection attempts
envoy_server_memory_allocated	Amount of memory currently allocated by the Envoy server in bytes