metrics: use promethues naming

vcsserver/http_main.py

@@ -400,7 +400,7 b' class HTTPApplication(object):'
             statsd = request.registry.statsd
             if statsd:
                 statsd.incr(
-                    'vcsserver_method_count', tags=[
+                    'vcsserver_method_total', tags=[
                         "method:{}".format(method),
                     ])
         return payload, remote, method, args, kwargs
@@ -690,7 +690,7 b' class HTTPApplication(object):'
 
         statsd = request.registry.statsd
         if statsd:
-            statsd.incr('vcsserver_exception')
+            statsd.incr('vcsserver_exception_total')
         raise exception
 
 

vcsserver/tweens/request_wrapper.py

@@ -63,14 +63,10 b' class RequestWrapperTween(object):'
                 elapsed_time_ms = 1000.0 * total
                 statsd.timing(
                     'vcsserver_req_timing', elapsed_time_ms,
-                    tags=[
-                        "path:{}".format(_path),
-                    ]
+                    tags=["path:{}".format(_path)]
                 )
                 statsd.incr(
-                    'vcsserver_req_count', tags=[
-                        "path:{}".format(_path),
-                    ])
+                    'vcsserver_req_total', tags=["path:{}".format(_path)])
         return response