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lib/prometheus/contrib/mnesia.ex
defmodule Prometheus.Contrib.Mnesia do
@moduledoc """
Mnesia instrumentation helpers.
"""
use Prometheus.Erlang, :prometheus_mnesia
@doc """
Returns sum of all mnesia files for the given `table` in bytes.
Mnesia can create different files for each table:
- .DAT - DETS files
- .TMP - temp files
- .DMP - dumped ets tables
- .DCD - disc copies data
- .DCL - disc copies log
- .LOGTMP - disc copies log
More on Mnesia files can be found in
<a href="http://erlang.org/doc/apps/mnesia/Mnesia_chap7.html">
Mnesia System Information chapter
</a> of Mnesia User's Guide
"""
defmacro table_disk_size(dir \\ quote do :mnesia.system_info(:directory) end, table) do
Erlang.call([dir, table])
end
@doc """
Returns {pcount, ccount} tuple, where
pcount is a number of participant transactions and
ccount is a number of coordinator transactions.
Can return {:undefined, :undefined} occasionally.
"""
defmacro tm_info() do
Erlang.call()
end
end