Yandex Cloud Postbox metrics

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Updated at April 3, 2026

This section describes the Yandex Cloud Postbox metrics delivered to Monitoring.

The name label contains the metric name.

Labels shared by all Yandex Cloud Postbox metrics:

Label	Value
identity	Sender address ID
service	Service label, always `postbox`

Email acceptance metrics

Metric name Type, units	Description
`inbound_emails_count` `RATE`, count	Number of emails accepted for delivery. If an email has multiple recipients, the metric will increase accordingly. For example, an email with three recipients will increment the metric by three.
`inbound_issues_rate` `RATE`, count	Number of issues during the email acceptance. The `kind` label indicates the issue category and takes the following values: `temporary quota issue`, `permanent quota issue`, `malformed email`, `smtp session error`, or `client notification issue`.

Metric name Type, units	Description
`process_duration_ms` `HIST_RATE`, milliseconds	End-to-end email processing time from acceptance until the delivery attempt completes.
`emails_processed_count` `RATE`, count	Number of processed emails regardless of the delivery result.
`delivery_success_count` `RATE`, count	Number of emails successfully delivered to recipients. This metric increments for each individual recipient.
`delivery_retry_count` `RATE`, count	Number of delivery retry attempts. Delivery is re-attempted if the recipient’s mail server is temporarily unavailable or returns a transient error.
`delivery_spam_count` `RATE`, count	Number of emails the recipient’s mail server has identified as spam.
`delivery_reject_count` `RATE`, count	Number of emails the recipient’s mail server has eventually rejected.

The topic label contains the name of the event notification topic.

Metric name Type, units	Description
`notifications_published_count` `RATE`, count	Number of event notifications successully published to the topic.
`notifications_error_rate` `RATE`, count	Number of errors when publishing notifications to the topic.