[Home](./index.md) > [fastify-metrics](./fastify-metrics.md) > [IHistogramOverrides](./fastify-metrics.ihistogramoverrides.md) > [help](./fastify-metrics.ihistogramoverrides.help.md) ## IHistogramOverrides.help property Request duration histogram help override **Signature:** ```typescript help?: string; ``` ## Default Value `request duration in seconds`