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implement running and total mnesia node count metrics #115

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925b7d1
implement running and total mnesia node count metrics
luos Jan 8, 2021
82c721c
implement node state metric for each mnesia connection
luos Jan 11, 2021
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27 changes: 25 additions & 2 deletions src/collectors/mnesia/prometheus_mnesia_collector.erl
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Original file line number Diff line number Diff line change
Expand Up @@ -124,7 +124,8 @@ metrics(EnabledMetrics) ->
MemoryUsage = get_memory_usage(),
TablewiseMemoryUsage = get_tablewise_memory_usage(),
TablewiseSize = get_tablewise_size(),

Nodes = mnesia:system_info(db_nodes),
Running = mnesia:system_info(running_db_nodes),
[{held_locks, gauge,
"Number of held locks.",
fun() -> ets:info(mnesia_held_locks, size) end},
Expand Down Expand Up @@ -157,7 +158,17 @@ metrics(EnabledMetrics) ->
fun() -> TablewiseMemoryUsage end},
{tablewise_size, gauge,
"Number of rows present per table",
fun() -> TablewiseSize end}
fun() -> TablewiseSize end},
{known_node_count, gauge,
"Count of known mnesia nodes",
fun() -> length(Nodes) end},
{running_node_count, gauge,
"Count of running mnesia nodes",
fun() -> length(Running) end},
{node_state,
gauge, "Mnesia connection state."
"The state is represented as a numerical value where not_connected = 0, connected = 1",
fun() -> get_node_state_metrics(Nodes, Running) end}
].

%%====================================================================
Expand Down Expand Up @@ -214,3 +225,15 @@ get_tablewise_size() ->
[{[{table, Tab}], mnesia:table_info(Tab, size)} | Acc]
end,
lists:foldl(Calculator, [], mnesia:system_info(tables)).

get_node_state_metrics(Nodes, Running) ->
LocalNode = node(),
lists:filtermap(fun(Node) ->
Labels = [{peer, Node}],
case lists:member(Node, Running) of
_ when LocalNode =:= Node -> false;
true ->
{true, {Labels, 1}};
false -> {true, {Labels, 0}}
end
end, Nodes).
10 changes: 9 additions & 1 deletion test/eunit/collectors/mnesia/prometheus_mnesia_collector_tests.erl
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Original file line number Diff line number Diff line change
Expand Up @@ -53,6 +53,9 @@ test_mnesia_on_collector_env_off() ->
?assertMatch(nomatch, re:run(Metrics, "erlang_mnesia_logged_transactions")),
?assertMatch(nomatch, re:run(Metrics, "erlang_mnesia_restarted_transactions")),
?assertMatch(nomatch, re:run(Metrics, "erlang_mnesia_memory_usage_bytes")),
?assertMatch(nomatch, re:run(Metrics, "erlang_mnesia_total_node_count")),
?assertMatch(nomatch, re:run(Metrics, "erlang_mnesia_running_node_count")),
?assertMatch(nomatch, re:run(Metrics, "erlang_mnesia_node_state")),
application:unset_env(prometheus,mnesia_collector_metrics,[]).

test_mnesia_on_collector() ->
Expand All @@ -66,7 +69,12 @@ test_mnesia_on_collector() ->
?assertMatch({match,_}, re:run(Metrics, "erlang_mnesia_committed_transactions")),
?assertMatch({match,_}, re:run(Metrics, "erlang_mnesia_logged_transactions")),
?assertMatch({match,_}, re:run(Metrics, "erlang_mnesia_restarted_transactions")),
?assertMatch({match,_}, re:run(Metrics, "erlang_mnesia_memory_usage_bytes")).
?assertMatch({match,_}, re:run(Metrics, "erlang_mnesia_memory_usage_bytes")),
?assertMatch({match,_}, re:run(Metrics, "erlang_mnesia_known_node_count 1")),
?assertMatch({match,_}, re:run(Metrics, "erlang_mnesia_running_node_count 1")),
% we dont have any node state in case of a single node cluster
?assertMatch(nomatch, re:run(Metrics, "erlang_mnesia_node_state")).


test_mnesia_on_collector_global_labels() ->
Metrics = try
Expand Down