InfluxDB's SHOW STATS command provides runtime statistics and diagnostics meta queries to monitor the system, including memory usage, HTTP requests, and input performance metrics such as Graphite and openTSDB. The internal database stores statistical data that can be analyzed using InfluxQL, allowing for long-term performance analysis and visualization through tools like Chronograf. Additionally, cluster-level statistics are available for the whole cluster, while diagnostic information is stored separately from the internal database and includes system details such as build version and uptime.