Yandex Monitoring metric reference

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Updated at March 24, 2026

This section describes API Gateway metrics delivered to Monitoring.

The name label contains the metric name.

API metrics

Labels shared by all API gateway metrics:

Label	Value
gateway	API gateway ID
path	Request path
release	API gateway version
operation	Request method, e.g., `GET` or `POST`
service	Service label, always `serverless-apigateway`

Metric name Type, units	Description Labels
`api_gateway.errors_count_per_second` `DGAUGE`, requests per second	Number of error requests per second. This metric features the `code` label containing the response code, e.g., `200`, `404`, or `502`.
`api_gateway.requests_count_per_second` `DGAUGE`, requests per second	Number of requests per second. This metric features the `code` label containing the response code, e.g., `200`, `404`, or `502`.
`api_gateway.requests_latency_milliseconds` `DGAUGE`, milliseconds	Response latency distribution histogram (API gateway response latency is the time span between it receiving the request's first byte and sending the response's last byte.) This metric features the `bin` label containing histogram buckets for latencies in milliseconds.
`api_gateway.requests_latency_milliseconds_count` `DGAUGE`, requests	Total requests with measured latency
`api_gateway.requests_latency_milliseconds_sum` `DGAUGE`, milliseconds	Total request processing latency

Labels shared by all WebSocket metrics:

Label	Value
gateway	API gateway ID
path	Request path
service	Service label, always `serverless-apigateway`

Metric name Type, units	Description Labels
`api_gateway.websocket_connections_count` `DGAUGE`, count	Number of active WebSocket connections
`api_gateway.websocket_disconnections_count_per_second` `DGAUGE`, units per second	Number of WebSocket disconnections per second. This metric features the `code` label containing the response code, e.g., `200`, `404`, or `502`.
`api_gateway.websocket_messages_bytes_per_second` `DGAUGE`, bytes per second	Size of data (in bytes) sent over WebSocket connections per second. Labels: `type`: Message type, e.g., `text`. `direction`: Message direction, `incoming` or `outcoming`.
`api_gateway.websocket_messages_count_per_second` `DGAUGE`, units per second	Number of messages sent over WebSocket connections per second. Labels: `type`: Message type, e.g., `text`. `direction`: Message direction, `incoming` or `outcoming`.

Labels shared by all trigger metrics:

Label	Value
trigger	Trigger ID
type	Entity type.
service	Service label, always `serverless-functions`

Metric name Type, unit	Entity type.	Description Labels
`serverless.triggers.access_error_per_second` `DGAUGE`, errors per second	`request`: Message distribution. `message_queue`: Accesses to Yandex Message Queue.	Frequency of access errors during message distribution.
`serverless.triggers.error_per_second` `DGAUGE`, errors per second	`request`: Message distribution. `message_queue`: Accesses to Yandex Message Queue.	Frequency of message distribution errors.
`serverless.triggers.execution_time_milliseconds` `IGAUGE`, invocations per millisecond	`request`: Message distribution.	Distribution histogram of messaging frequency over request processing time. Request processing intervals are stored in the `bin` label.
`serverless.triggers.inflight` `DGAUGE`, invocations	`request`: Message distribution.	Number of concurrent message distributions.
`serverless.triggers.read_events_per_second` `DGAUGE`, units per second	`incoming`: Events that have set off any trigger other than a trigger for Yandex Message Queue. `message_queue`: Events that have set off a trigger for Yandex Message Queue.	Frequency of events that set off a trigger.