metrics: use non decimal version for timer.

- added bucket registry
- some small fixes

rhodecode/config/middleware.py

@@ -135,10 +135,10 @@ def make_pyramid_app(global_config, **settings):
     log.info('Pyramid app `%s` created and configured in %.2fs',
              pyramid_app.func_name, total_time)
     if statsd:
-        elapsed_time_ms = 1000.0 * total_time
+        elapsed_time_ms = round(1000.0 * total_time)  # use ms only rounded time
         statsd.timing('rhodecode_app_bootstrap_timing', elapsed_time_ms, tags=[
             "pyramid_app:{}".format(pyramid_app.func_name)
-        ])
+        ], use_decimals=False)
     return pyramid_app