From 4e055a949569b1c14b19a02db5d2ea80212fbc00 Mon Sep 17 00:00:00 2001
From: Michal Piotrowski <michal.piotrowski@erlang-solutions.com>
Date: Fri, 25 Sep 2015 15:39:19 +0200
Subject: [PATCH 1/2] add node uptime metric

---
 apps/ejabberd/src/mongoose_metrics.erl | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/apps/ejabberd/src/mongoose_metrics.erl b/apps/ejabberd/src/mongoose_metrics.erl
index 63c5c09df28..ae4df3c2270 100644
--- a/apps/ejabberd/src/mongoose_metrics.erl
+++ b/apps/ejabberd/src/mongoose_metrics.erl
@@ -38,6 +38,7 @@
          get_odbc_data_stats/0,
          get_odbc_mam_async_stats/0,
          get_dist_data_stats/0,
+         get_up_time/0,
          remove_host_metrics/1,
          remove_all_metrics/0]).
 
@@ -110,6 +111,10 @@ create_generic_hook_metric(Host, Hook) ->
 increment_generic_hook_metric(Host, Hook) ->
     do_increment_generic_hook_metric([Host, filter_hook(Hook)]).
 
+-spec get_up_time() -> {value, integer()}.
+get_up_time() ->
+    {value, erlang:round(element(1, erlang:statistics(wall_clock))/1000)}.
+
 do_create_generic_hook_metric({_, skip}) ->
     ok;
 do_create_generic_hook_metric(MetricName) ->
@@ -358,7 +363,10 @@ get_histograms(Host) ->
            eval, ?EX_EVAL_SINGLE_VALUE}},
          {[global, nodeSessionCount],
           {function, ejabberd_sm, get_node_sessions_number, [],
-           eval, ?EX_EVAL_SINGLE_VALUE}}
+           eval, ?EX_EVAL_SINGLE_VALUE}},
+         {[global, nodeUpTime],
+          {function, mongoose_metrics, get_up_time, [],
+           tagged, [value]}}
         ]
 ).
 

From 64a2cc26c27431fe221c5840f0b0d0ed90ab75e4 Mon Sep 17 00:00:00 2001
From: Michal Piotrowski <michal.piotrowski@erlang-solutions.com>
Date: Mon, 28 Sep 2015 10:01:44 +0200
Subject: [PATCH 2/2] test nodeUpTime metric via HTTP API

---
 test/ejabberd_tests/tests/metrics_api_SUITE.erl | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/test/ejabberd_tests/tests/metrics_api_SUITE.erl b/test/ejabberd_tests/tests/metrics_api_SUITE.erl
index e31afe3c55b..15711f0fb57 100644
--- a/test/ejabberd_tests/tests/metrics_api_SUITE.erl
+++ b/test/ejabberd_tests/tests/metrics_api_SUITE.erl
@@ -38,7 +38,8 @@ groups() ->
                     one_iq_error,
                     one_presence_error
                    ]},
-     {global, [], [session_counters]}
+     {global, [], [session_counters,
+                   node_uptime]}
     ].
 
 init_per_suite(Config) ->
@@ -194,7 +195,11 @@ session_counters(Config) ->
                3 = fetch_global_counter_value(nodeSessionCount, Config)
        end).
 
-
+node_uptime(Config) ->
+      X = fetch_global_counter_value(nodeUpTime, Config),
+      timer:sleep(timer:seconds(1)),
+      Y = fetch_global_counter_value(nodeUpTime, Config),
+      true = Y > X.
 %%--------------------------------------------------------------------
 %% Helpers
 %%--------------------------------------------------------------------