Why it matters

Right metrics reveal issues before user impact. Understanding shapes proactive ops.

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The architecture

Per-RegionServer: read/write latency percentiles, memstore size, GC stats.

Per-region: request count, size.

HBase critical metricsLatency percentilesp50/95/99Memstore + cachesize + hit rateCompaction + GCqueue + timeAlerting on p99 spikes + compaction queue growth catches most issues early
Metrics categories.
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How it works end to end

Cluster: regions in transition, RS count, WAL sync latency.

Export: Prometheus JMX exporter typical.

Dashboards: Grafana with HBase templates.