This page covers the metrics tracked by Rockset for performance monitoring and errors with [<<glossary:Query Lambdas>>](🔗).

## Last Execution Metrics

Metrics on the last execution of a [<<glossary:Query Lambda>>](🔗) can be accessed by requesting them through the [<<glossary:Rockset API>>](🔗) and reading the `stats` value found in the API response, or by navigating to the [Query Lambdas tab of the Rockset Console](🔗) and then selecting your Query Lambda.

Information is available for the following metrics:

  • **Last Executed**: denoted the timestamp of the last execution

  • **Last Executed By**: denotes the email of the user associated with the last execution

  • **Last Execution Error**: denotes the timestamp of the error surfaced by the last execution (if applicable)

  • **Last Execution Error Message**: contains the error message associated with error surfaced by the last execution (if applicable)

## Aggregated Metrics

Usage charts showing aggregated metrics for individual Query Lambdas can be found by navigating to the [Query Lambdas tab of the Rockset Console](🔗), selecting your Query Lambda, and then going to the **Metrics** tab.

Query Lambda Usage Charts


From there, interactive graphs are available for the following metrics:

  • **Query Count**, denoting the total number of query requests (via its REST endpoint) and the total number of errors over a specified time period

  • **Query Latency** of all executions of the Query Lambda over a specified time period