[Home](./index.md) > [fastify-metrics](./fastify-metrics.md) > [IMetricsPluginOptions](./fastify-metrics.imetricspluginoptions.md) > [promClient](./fastify-metrics.imetricspluginoptions.promclient.md) ## IMetricsPluginOptions.promClient property PromClient instance to override default internal promClient **Signature:** ```typescript promClient: typeof client | null; ``` ## Default Value promClient