They're sometimes interactive HTTP endpoints, not metrics, although metrics are served by one of them (/varz, described in the SRE book). They're informally cal

They're sometimes interactive HTTP endpoints, not metrics, although metrics are served by one of them (/varz, described in the SRE book). They're informally called z pages and are the inspiration behind the /debug handlers that Go's net/trace package installs: https://pbs.twimg.com/media/CebGW64W4AAJ_sc?format=jpg https://pbs.twimg.com/media/CebGW64W4AAJ_sc?format=jpg OpenCensus has a bunch, too: https://opencensus.io/zpages/ https://opencensus.io/zpages/