clean unused stuff from ns_server_stats

Change-Id: If32f215adc3537e83696086ba0e3b95eaf51d020
Reviewed-on: http://review.couchbase.org/c/ns_server/+/159325
Well-Formed: Build Bot <[email protected]>
Tested-by: Artem Stemkovski <[email protected]>
Reviewed-by: Timofey Barmin <[email protected]>

Author: vzasade

src/ns_server_stats.erl

@@ -36,11 +36,11 @@
 -export([init_stats/0, notify_counter/1, notify_counter/2, notify_gauge/2,
          notify_histogram/2, notify_histogram/4, notify_max/2]).
 
--export([increment_counter/1, increment_counter/2,
-         get_ns_server_stats/0, set_counter/2,
+-export([increment_counter/2,
+         get_ns_server_stats/0,
          add_histo/2,
-         cleanup_stale_epoch_histos/0, log_system_stats/1,
-         stale_histo_epoch_cleaner/0, report_prom_stats/2]).
+         stale_histo_epoch_cleaner/0,
+         report_prom_stats/2]).
 
 -type os_pid() :: integer().
 
@@ -523,9 +523,6 @@ process_stats(TS, Binary, PrevSample, State) ->
     sample_ns_memcached_queues(),
     {RetStats, NewPrevSample}.
 
-increment_counter(Name) ->
-    increment_counter(Name, 1).
-
 increment_counter(Name, By) ->
     try
         do_increment_counter(Name, By)