Yandex Monitoring metric reference

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Updated at April 28, 2025

API metrics
WebSocket metrics

This section describes API Gateway metrics delivered to Monitoring.

The name label contains the metric name.

All API Gateway metrics share the following labels:

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

API metrics

Labels shared by all API gateway metrics:

Label	Value
release	API gateway version
operation	Request method, e.g., `GET` and `POST`

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

WebSocket metrics

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`.

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