# Recorder The Recorder captures a function's output and stores it as time-series data in the [internal InfluxDB](/app-builder/build-backend/function-explorer/storage/timeseries-database.md). This allows you to store a data stream, visualize it within your applications, or analyze it as required. It records data during both build-time (in test mode) and the app's runtime. The recorder has two settings: * **Measurement Name**: You must provide a unique name for the measurement in the recorder's text box. * **Retention Policy**: Right-click the circle icon (which defaults to 'F' for Forever) to set how long the recorded data should be stored. Options range from one hour to a year, or forever. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.heisenware.com/app-builder/build-backend/recorder.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.