> ## Documentation Index
> Fetch the complete documentation index at: https://docs.vortexiq.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Coordinator Write Latency p99 (ms), Apache Cassandra KPI card, Vortex IQ Nerve Centre

> ClientRequest Write latency p99. Writes are normally cheap in Cassandra - high p99 = commitlog / GC pressure.

**[Nerve Centre KPIs](/nerve-centre/kpi-cards/cassandra) · [Audit Profile](/nerve-centre/kpi-cards/cassandra/audit) · [Sentiment Settings](/nerve-centre/kpi-cards/cassandra/sentiment)**

## At a glance

* **Category:** Performance
* **Type:** Supporting Metrics
* **Chart:** kpi
* **Format:** number
* **Time window:** RT/5m
* **Alert trigger:** >500ms

## Calculation

ClientRequest Write latency p99. Writes are normally cheap in Cassandra - high p99 = commitlog / GC pressure.

## Known limitations

*Known limitations, FAQs, or reconciliation notes specific to this card. Replace this block when authored.*