Send queue runner stats to statsd

This is currently done by a separate program that periodically
calls "hydra-queue-runner --status". Eventually, I'll do this
in the queue runner directly.

Fixes #220.

release.nix

@@ -81,6 +81,18 @@ in rec {
 
       #nix = nixUnstable;
 
+      NetStatsd = buildPerlPackage {
+        name = "Net-Statsd-0.11";
+        src = fetchurl {
+          url = mirror://cpan/authors/id/C/CO/COSIMO/Net-Statsd-0.11.tar.gz;
+          sha256 = "0f56c95846c7e65e6d32cec13ab9df65716429141f106d2dc587f1de1e09e163";
+        };
+        meta = {
+          description = "Sends statistics to the stats daemon over UDP";
+          license = "perl";
+        };
+      };
+
       perlDeps = buildEnv {
         name = "hydra-perl-deps";
         paths = with perlPackages;
@@ -116,6 +128,7 @@ in rec {
             LWP
             LWPProtocolHttps
             NetAmazonS3
+            NetStatsd
             PadWalker
             Readonly
             SQLSplitStatement