# Tool Usage Metrics The tool usage metrics marts are meant to provide users with more information about LTI tools that send Caliper events to the *event\_store.expanded* table. These marts include data such as the time of the earliest and latest Caliper event for the tool and the number of Caliper events for the tool. The marts can be used for monitoring, as they track instances of low activity for a tool that may indicate an outage. ## Data Marts * [Tool Usage Metrics](/products/data-and-analytics/unizin-data-platform/data-stores/data-marts/tool-usage-metrics/tool-usage-metrics.md) * [Tool Usage Metrics Archive ](/products/data-and-analytics/unizin-data-platform/data-stores/data-marts/tool-usage-metrics/tool-usage-metrics-archive.md) * [Tool Low Events](/products/data-and-analytics/unizin-data-platform/data-stores/data-marts/tool-usage-metrics/tool-low-events.md) --- # 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://resources.unizin.org/products/data-and-analytics/unizin-data-platform/data-stores/data-marts/tool-usage-metrics.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.