> ## 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.

# Request Error Rate %, Apache Cassandra KPI card, Vortex IQ Nerve Centre

> ClientRequest Failures + Timeouts + Unavailables as % of total reads + writes.

**[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:** Errors
* **Type:** Key Metrics
* **Chart:** gauge
* **Format:** percent
* **Time window:** 5m
* **Alert trigger:** >1%

## Calculation

ClientRequest Failures + Timeouts + Unavailables as % of total reads + writes.

## Known limitations

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