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RabbitMQ

Monitor RabbitMQ clusters, nodes, queues, connections, messages, churn, alarms, and resource usage.

Guides

Guides overview 1 page

RabbitMQ Operations Guides

Practical guides for running, troubleshooting, and monitoring RabbitMQ in production.

RabbitMQ Operations Guides 20 pages

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RabbitMQ ACCESS_REFUSED - Login was refused: authentication failures and credential rotation

Diagnose RabbitMQ 'ACCESS_REFUSED - Login was refused using authentication mechanism PLAIN' errors: stale credentials after rotation, disabled users, guest-from-remote, LDAP backend failures, and brute-force floods, plus how to stop the reconnect churn they cause.

RabbitMQ connection blocked / blocking: publishers frozen by a resource alarm

Why RabbitMQ connections enter the blocking or blocked state, how to tell it apart from flow control, and how to unblock publishers frozen by a memory or disk resource alarm.

RabbitMQ connection in flow state: credit-based backpressure explained

What RabbitMQ's per-connection flow state actually means, how credit-based backpressure works inside the broker, and when sustained flow is a real write-path bottleneck.

RabbitMQ connection storm: reconnect loops, FD pressure, and CPU spent on handshakes

Diagnose and stop a RabbitMQ connection storm: reconnect loops driving churn, file descriptor and socket pressure, and Erlang scheduler CPU burned on connection handshakes.

RabbitMQ consumer timeout: delivery acknowledgement timed out and the channel is closed

Why RabbitMQ closes channels with 'delivery acknowledgement timed out', how the consumer_timeout mechanism works, and how to diagnose and fix slow or stuck consumers.

RabbitMQ consumers connected but not acknowledging: the consumer black hole

RabbitMQ shows consumers attached but ack rate is zero and messages_ready is rising. How to diagnose stuck consumers, zombie connections, and downstream stalls before the memory alarm fires.

RabbitMQ disk free limit alarm: free disk space insufficient and publishing halted

Diagnose and recover from the RabbitMQ disk_free_alarm that blocks all publishers cluster-wide when free disk drops below disk_free_limit.

RabbitMQ disk_free_limit at the default 50MB: the production footgun

Why RabbitMQ's default 50MB disk_free_limit halts publishing cluster-wide on any modern server, and how to set a safe absolute or relative limit with a sane alerting floor.

RabbitMQ file descriptor exhaustion: fd_used near fd_total and refused connections

Diagnose and fix RabbitMQ file descriptor exhaustion when fd_used approaches fd_total, new connections are refused, and queue file operations start failing.

RabbitMQ flow control vs resource alarms: the two throttling mechanisms operators confuse

RabbitMQ has two independent throttling mechanisms: per-connection credit-based flow control (state: flow) and cluster-wide resource alarms (state: blocked). Learn to tell them apart and alert on each correctly.

RabbitMQ memory resource limit alarm: publishers blocked across the whole cluster

What the RabbitMQ memory resource limit alarm means, why one node blocks publishers cluster-wide, and how to find and fix the cause without restarting the broker.

RabbitMQ memory usage climbing toward the watermark: mem_used vs mem_limit

How to read RabbitMQ's mem_used and mem_limit, why the ratio is the leading gauge before the memory alarm, and what to do when it climbs past 0.7.

RabbitMQ messages lost on restart: durable queues, persistent messages, and transient traps

Why RabbitMQ messages disappear after a broker restart: the durable queue plus persistent message requirement, transient traps, and the classic queue fsync gap.

RabbitMQ monitoring checklist: the signals every production broker needs

A four-level RabbitMQ monitoring checklist for production brokers, from survival signals like mem_alarm and disk_free_alarm to expert signals like head message age and consumer utilisation.

RabbitMQ network partition detected: split-brain in cluster_status

What the Network Partitions section of rabbitmqctl cluster_status means, how to confirm a real split versus a false positive, and how to respond without making data divergence worse.

RabbitMQ node down: telling a dead broker apart from a partitioned one

How to distinguish a genuinely dead RabbitMQ node from a network-partitioned one, using the running field, partitions array, cluster link traffic, and the quorum-critical check.

RabbitMQ node is quorum critical: checking before a rolling restart

How to use rabbitmq-diagnostics check_if_node_is_quorum_critical and the /api/health/checks/node-is-quorum-critical endpoint to gate rolling restarts so you never take a quorum queue below its online majority.

RabbitMQ NOT_FOUND - no queue or exchange: publishing to something that does not exist

Why RabbitMQ closes your channel with 404 NOT_FOUND when you publish to or consume from an exchange or queue that does not exist, how to find what is missing, and how to stop it recurring after deploys.

RabbitMQ PRECONDITION_FAILED - inequivalent arg: redeclaring a queue with different properties

Why RabbitMQ closes the channel with 406 PRECONDITION_FAILED when a client redeclares a queue or exchange with different arguments, and how to reconcile it safely.

RabbitMQ RESOURCE_LOCKED - cannot obtain exclusive access to queue

Diagnose and fix RabbitMQ channel error 405 RESOURCE_LOCKED when a second connection tries to use an exclusive queue still owned by another connection.

Academy

RabbitMQ Monitoring

Learn everything about monitoring & troubleshooting RabbitMQ, what metrics are important to monitor and why, and how to monitor RabbitMQ with Netdata.

Case Studies

Monitoring Industrial Equipment Manufacturing with Netdata

Harnessing Real-Time Insights for Scalable and Reliable Production

InRento Case Study: Fintech Cloud Monitoring Wins

Overcoming Cloud Migration Challenges and Enhancing Operational Resilience

Resources

Best RabbitMQ Monitoring Tools (2026): 10 Ranked & Reviewed

Compare the 10 best RabbitMQ monitoring tools for 2026: queue depth, message rates, and broker health tracked by Netdata, Prometheus, Datadog, and more.