Available metrics in Prometheus format

The following table lists metrics that are exposed, i.e., for monitoring licensed throughput and common indicator values. Prometheus supports different metric types such as counter, gauge, histogram, and summary.

Container	Metric name	Metric type	Description
Engine	Standard Envoy metrics – see Envoy documentation.	–	Note that metrics are named statistics in the Envoy online documentation: Envoy listener statistics Envoy observability statistics
	`airlock_microgateway_engine_build_info`	gauge	Metric shows the static value 1, labeled by the Migrogateway Engine version information. Example: `airlock_microgateway_engine_build_info{version="4.1.0"} 1`
	`airlock_microgateway_engine_http_requests_blocked_total`	counter	Number of requests which were blocked by an Airlock Microgateway filter.
	`airlock_microgateway_engine_triggered_deny_rule_total`	counter	Number of requests which triggered the built-in deny rules.
	`airlock_microgateway_engine_license_ratelimit_requests_total`	counter	Number of requests counted by the license filter.
	`airlock_microgateway_engine_license_ratelimit_requests_allowed_within_limit_total`	counter	Number of requests within the licensed rate limit.
	`airlock_microgateway_engine_license_ratelimit_requests_allowed_service_error_total`	counter	Number of allowed requests despite an error or unavailability of the License Guard.
	`airlock_microgateway_engine_license_ratelimit_requests_blocked_service_error_total`	counter	Number of blocked requests due to an error or unavailability of the License Guard.
	`airlock_microgateway_engine_license_ratelimit_requests_blocked_over_limit_total`	counter	Number of blocked requests due to exceeding the licensed limit.
	`airlock_microgateway_engine_license_ratelimit_requests_blocked_unlicensed_total`	counter	Number of blocked requests due to an invalid/missing license or an unlicensed number of sidecars.
License Guard	`airlock_microgateway_license_guard_current_requests_per_second`	gauge	An approximate sliding-window average (>=0) of the combined throughput of all Airlock Microgateway Engines.
	`airlock_microgateway_license_guard_config_load_success_total`	counter	Number of times the xDS configuration was successfully updated.
	`airlock_microgateway_license_guard_config_load_error_total`	counter	Number of times the xDS configuration update failed.
	`airlock_microgateway_license_guard_grpc_ratelimit_requests_total`	counter	Number of ratelimit gRPC requests received.
	`airlock_microgateway_license_guard_response_time_seconds`	histogram	Response time histogram for rate limit requests.
	`airlock_microgateway_license_guard_errors_total`	counter	Total number of errors of a certain type.
Operator	`airlock_microgateway_sidecars`	gauge	The number of injected Airlock Microgateway Engine sidecars managed by this Operator instance.
	`airlock_microgateway_license_max_sidecars` ¹	gauge	The licensed sidecar count. A value of `inf` means there is no limit.
	`airlock_microgateway_license_valid` ¹	gauge	Whether the Airlock Microgateway Operator has a valid license (`1`) or not (`0`).
	`airlock_microgateway_license_is_premium` ¹	gauge	Whether the active license (if any) is a premium license (`1`) or not (`0`).
	`airlock_microgateway_license_max_requests_per_second` ¹	gauge	The licensed throughput.
	`airlock_microgateway_license_expiry_timestamp_seconds` ¹	gauge	(Unix) timestamp when the active license expires.
	`airlock_microgateway_license_rate_limiting_enforced` ¹	gauge	Whether the Airlock Microgateway Operator currently enforces the licensed throughput limit (`1`) or not (`0`).

License-related metric. See also Licensing and license-dependent behavior article.
Note that when the license changes, the metrics are updated and the license status changed is logged. This can take up to 1 minute after the secret is adjusted since Kubernetes updates mounted config maps only periodically.