Changelog

Queues, Cloudflare's managed message queue, now exposes realtime backlog metrics via the dashboard, REST API, and JavaScript API. Three new fields are available:

• backlog_count — the number of unacknowledged messages in the queue
• backlog_bytes — the total size of those messages in bytes
• oldest_message_timestamp_ms — the timestamp of the oldest unacknowledged message

The following endpoints also now include a metadata.metrics object on the result field after successful message consumption:

• /accounts/{account_id}/queues/{queue_id}/messages/pull
• /accounts/{account_id}/queues/{queue_id}/messages
• /accounts/{account_id}/queues/{queue_id}/messages/batch

Call env.QUEUE.metrics() to get realtime backlog metrics:

const {
  backlogCount, // number
  backlogBytes, // number
  oldestMessageTimestamp, // Date | undefined
} = await env.QUEUE.metrics();

env.QUEUE.send() and env.QUEUE.sendBatch() also now return a metrics object on the response.

You can also query these fields via the GraphQL Analytics API or view realtime backlog on the dashboard ↗.

For more information, refer to Queues metrics.