Monitor ClickHouse replication lag and read-only replicas
Track replica lag, read-only replicas, the replication queue and distributed DDL across every shard — visualized on a live cluster topology map, with alerts when replication falls behind.
Built for this, not bolted on
See the whole topology
Nodes, shards, replicas and the Keeper quorum on one interactive map, with live replication and coordination links.
Replication lag and read-only replicas
Health checks flag lag and read-only replicas before they become an outage, with an optional alert to Slack or Discord when a replica falls behind your threshold.
Replication & DDL queues
Inspect the replication queue, replicated fetches and the distributed DDL queue to see exactly what is in flight or stuck on each replica.
Community
Open source, built in public
Related
More ways to monitor ClickHouse
ClickHouse monitoring
The ops checklist: system.* dashboards for queries, storage, and replication, plus a recommend-only advisor.
Query monitoring
Running, slow, failed and expensive queries — with kill and recommend-only EXPLAIN suggestions.
Cluster health
A color-coded health board with Slack/Discord alerts and recovery notifications.
Performance
Slowest/most-expensive queries plus a recommend-only tuning and capacity advisor.
ClickHouse dashboard
Pre-built ops pages for queries, health, storage and replication — versus building Grafana panels yourself.
Start monitoring — advisor and alerts built in
Open the hosted dashboard and connect a cluster, or self-host with Docker, Kubernetes, or from source. Self-hosting is always free.
