InfluxDB's debug/vars endpoint provides diagnostic information about the instance, including key-value pairs and InfluxDB-formatted expvars that correspond to metrics such as memory usage, CPU usage, and command line arguments used to invoke the process. The output is in JSON format and can be accessed via a custom HTTP endpoint or through third-party tools like Telegraf's input plugin, which supports ingesting InfluxDB-formatted expvars from a remote HTTP endpoint. Additionally, emitting InfluxDB-formatted expvars can be done in one's own application using a minimal amount of code, allowing for centralized monitoring of multiple instances.