Writing Prometheus exporters

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Writing Prometheus exporters in theory and practice

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4 .Exposition Format # HELP http_requests_total The total number of HTTP requests. # TYPE http_requests_total counter http_requests_total{method="post",code="200"} 1027 1395066363000 http_requests_total{method="post",code="400"} 3 1395066363000 {__name__="http_requests_total",method="post",code="400"} 4 © 2017 Percona

14 .Tradeoffs ▪ Perfect data: proper metric names, labeld, types, descriptions, stateless, no caching, etc ▪ Quick and dirty implementation: SELECT * FROM i_s, convert columns to UNTYPED metrics without labels 7 © 2017 Percona

15 .Tradeoffs ▪ Perfect data: proper metric names, labeld, types, descriptions, stateless, no caching, etc ▪ Quick and dirty implementation: SELECT * FROM i_s, convert columns to UNTYPED metrics without labels ▪ Something in between 7 © 2017 Percona

17 .Metric Names: Namespaces ▪ Exporter name, service name, or some common namespace ▪ mysql_perf_schema_table_io_waits_seconds_total ▪ mysql_up ▪ go_gc_duration_seconds, go_goroutines ▪ process_cpu_seconds_total, process_open_fds ▪ scrape_duration_seconds, scrape_samples_scraped 9 © 2017 Percona

22 .Metric Names: Main Part ▪ mysql_perf_schema_table_io_waits_seconds_total ▪ Exactly one subsystem ▪ Should represent the same logical thing-being-measured across all label dimensions 10 © 2017 Percona

23 .Metric Names: Main Part ▪ mysql_perf_schema_table_io_waits_seconds_total ▪ Exactly one subsystem ▪ Should represent the same logical thing-being-measured across all label dimensions ▪ As a rule of thumb, aggregation over all label dimensions of a given metric should be meaningful (though not necessarily useful) 10 © 2017 Percona

24 .Metric Names: Main Part ▪ mysql_perf_schema_table_io_waits_seconds_total ▪ Exactly one subsystem ▪ Should represent the same logical thing-being-measured across all label dimensions ▪ As a rule of thumb, aggregation over all label dimensions of a given metric should be meaningful (though not necessarily useful) ▪ Extra care must be taken if names (and types, and descriptions) are generated programmatically (IOWaits -> i_o_waits) 10 © 2017 Percona

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