Replace self-rolled statsd instrumention with localshred/nsa (#5118)

Gemfile.lock

@@ -289,6 +289,11 @@ GEM
       mini_portile2 (~> 2.2.0)
     nokogumbo (1.4.13)
       nokogiri
+    nsa (0.2.4)
+      activesupport (>= 4.2, < 6)
+      concurrent-ruby (~> 1.0.0)
+      sidekiq (>= 3.5.0)
+      statsd-ruby (~> 1.2.0)
     oj (3.3.5)
     openssl (2.0.5)
     orm_adapter (0.5.0)
@@ -483,7 +488,7 @@ GEM
     sshkit (1.14.0)
       net-scp (>= 1.1.2)
       net-ssh (>= 2.8.0)
-    statsd-instrument (2.1.4)
+    statsd-ruby (1.2.1)
     strong_migrations (0.1.9)
       activerecord (>= 3.2.0)
     temple (0.8.0)
@@ -578,6 +583,7 @@ DEPENDENCIES
   microformats (~> 4.0)
   mime-types (~> 3.1)
   nokogiri (~> 1.7)
+  nsa (~> 0.2)
   oj (~> 3.0)
   ostatus2 (~> 2.0)
   ox (~> 2.5)
@@ -617,7 +623,6 @@ DEPENDENCIES
   simple_form (~> 3.4)
   simplecov (~> 0.14)
   sprockets-rails (~> 3.2)
-  statsd-instrument (~> 2.1)
   strong_migrations
   twitter-text (~> 1.14)
   tzinfo-data (~> 1.2017)