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config/sys.config: increase StatsD reporter interval to 10s

A 1-second reporting interval causes noticeable CPU overhead as the
number of active metrics grows.  With per-eNB and per-MME counters,
the metric set scales with the number of connected eNBs/MMEs.

Increase the default StatsD reporting interval from 1s to 10s to
reduce that overhead.  Update the documentation.

Change-Id: Icd5e1a43d1df4a4909fe742aec67cc51a01bb857
---
M config/sys.config
M doc/manuals/chapters/configuration.adoc
2 files changed, 6 insertions(+), 6 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/erlang/osmo-s1gw refs/changes/24/42424/1

diff --git a/config/sys.config b/config/sys.config
index 3c8f0f3..d428765 100644
--- a/config/sys.config
+++ b/config/sys.config
@@ -88,11 +88,11 @@
      },
      {subscribers,
       [%%{select, {[{ {['_' | '_'],'_','_'}, [], ['$_']}],
-       %% exometer_report_tty, value, 1000, true}}
+       %% exometer_report_tty, value, 10_000, true}}
        {select, {[{ {['_' | '_'],counter,'_'}, [], ['$_']}],
                  exometer_report_statsd,
                  value,
-                 1000,
+                 10_000,
                  true,
                  [{report_type, counter}]
                 }
@@ -100,7 +100,7 @@
        {select, {[{ {['_' | '_'],gauge,'_'}, [], ['$_']}],
                  exometer_report_statsd,
                  value,
-                 1000,
+                 10_000,
                  true,
                  [{report_type, gauge}]
                 }
diff --git a/doc/manuals/chapters/configuration.adoc b/doc/manuals/chapters/configuration.adoc
index 337f8b3..0d4315f 100644
--- a/doc/manuals/chapters/configuration.adoc
+++ b/doc/manuals/chapters/configuration.adoc
@@ -279,10 +279,10 @@
         ]},
         {subscribers, [
             {select, {[{ {['_'|'_'], counter, '_'}, [], ['$_']}],
-                       exometer_report_statsd, value, 1000, true,
+                       exometer_report_statsd, value, 10_000, true,
                        [{report_type, counter}]}},
             {select, {[{ {['_'|'_'], gauge, '_'}, [], ['$_']}],
-                       exometer_report_statsd, value, 1000, true,
+                       exometer_report_statsd, value, 10_000, true,
                        [{report_type, gauge}]}}
         ]}
     ]}
@@ -301,7 +301,7 @@
 
 The `subscribers` list uses exometer's `select` mechanism to
 automatically subscribe all counters and gauges to the StatsD reporter
-with a reporting interval of 1000 ms.  To disable StatsD reporting,
+with a reporting interval of 10 000 ms.  To disable StatsD reporting,
 comment out or remove the `exometer_report_statsd` reporter entry.
 
 // vim:set ts=4 sw=4 et:

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