Metrics are captured to provide insight into the overall performance of the system, such as rule / sql execution frequency / durations.
The execution of rules will invoke SQL which will be stored and reported in the Metrics page under the Rules tab. Columns can be sorted by selecting the column header and the +/- will expand or collapse the details showing first and last execution date, and shortest and longest execution times.
The SQL Metrics show all queries to an SQL database for the selected API Project. The columns can be sorted and the details show the frequency (# execs) and range of execution performance. This can be helpful to identify and tune performance access of API queries.
The Admin metrics show the internal SQL used by the API Server to access the metadata (information about the REST services).