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View default metrics

Review the metrics that are automatically collected and sent to the Gloo telemetry gateway when you enable the metrics/ui default pipeline in the Gloo OpenTelemetry pipeline. Metrics that are available to the telemetry gateway or telemetry collector agents can be forwarded to third-party solutions, such as Datadog.

You can configure your Gloo telemetry pipeline to scrape more metrics and make them available to the telemetry gateway so that you can forward them for a third-party solution. For more information, see Scrape Gloo management server metrics and Enable Cilium metrics.

Metric category	Metrics
Istio proxy metrics	`istio_requests_total` `istio_request_duration_milliseconds` `istio_request_duration_milliseconds_bucket` `istio_request_duration_milliseconds_count` `istio_request_duration_milliseconds_sum` `istio_tcp_sent_bytes_total` `istio_tcp_received_bytes_total` `istio_tcp_connections_opened_total`
Istiod metrics	`pilot_proxy_convergence_time`
Gloo Platform metrics	`gloo_mesh_reconciler_time_sec` `relay_pull_clients_connected` `relay_push_clients_connected` `relay_push_clients_warmed`
Cilium metrics (if the Cilium CNI is enabled)	`hubble_flows_processed_total` `hubble_drop_total`
OTel pipeline metrics	`otelcol_processor_refused_metric_points` `otelcol_processor_dropped_metric_points`

Gloo management server metrics

Gloo management server metrics are automatically scraped by the built-in Prometheus and can be viewed by accessing the Prometheus UI directly or by opening the Gloo operations dashboard in Grafana. However, these metrics are not made available to the Gloo telemetry gateway by default.

You can configure your Gloo OTel pipeline to scrape these metrics from the Gloo management server and make these metrics available to the Gloo telemetry gateway so that you can forward them to third-party services. For more information, see Scrape Gloo management server metrics.

Cilium metrics

If your cluster uses the Cilium CNI, such as when you installed Gloo Network, you can add a processor to your telemetry collectory configuration to collect all Hubble and Cilium metrics that are emitted by the Cilium agent. For more information, see Enable Cilium metrics.