commit | 1bcffbdd260ac600336bb74db592b2481bb6a2e6 | [log] [tgz] |
---|---|---|
author | Robert Newson <rnewson@apache.org> | Sat Nov 01 16:32:16 2014 +0000 |
committer | Robert Newson <rnewson@apache.org> | Sun Nov 02 18:49:45 2014 +0000 |
tree | c19b2d198512f2b3aa89c0e7910f3f85a4e62e80 | |
parent | b36854774c27b1c6a5a321b7b86d41053891cfd3 [diff] |
update_histogram with timing of a function
couch_stats is a simple statistics collection app for Erlang applications. Its core API is a thin wrapper around a stat storage library (currently Folsom,) but abstracting over that library provides several benefits:
All references to stat storage are in one place, so it's easy to swap the module out.
Some common patterns, such as tying a process's lifetime to a counter value, are straightforward to support.
Configuration can be managed in a single place - for example, it's much easier to ensure that all histogram metrics use a 10-second sliding window if those metrics are instantiated/configured centrally.
[atom()]
.counter
, gauge
, or histogram
.If you don‘t add your metric to a description file, your metric will be accessible via couch_stats:sample/1
, but it won’t be read by the stats collector and therefore won't be available to HTTP _stats
requests, etc.
Tell couch_stats to use your description file via application configuration.
Instrument your code with the helper functions in couch_stats.erl
.