Update the default metrics.yml file

Work items:

- Added "user_id" to default groupby attributes
- Replaced "flavor" metadata by "flavor_name" for instances (it is the
  default attribute name in gnocchi)
- Replaced network.incoming/outgoing.bytes by
  network.incoming/outgoing.bytes.rate. The previous metrics were cumulative,
  whereas the new ones are rates.

Change-Id: I55271bfbdd5a3457bea249dbefefd93a78ee057e

etc/cloudkitty/metrics.yml

@@ -4,9 +4,10 @@ metrics:
     alt_name: instance
     groupby:
       - id
+      - user_id
       - project_id
     metadata:
-      - flavor
+      - flavor_name
       - flavor_id
       - vcpus
     mutate: NUMBOOL
@@ -19,6 +20,7 @@ metrics:
     factor: 1/1048576
     groupby:
       - id
+      - user_id
       - project_id
     metadata:
       - container_format
@@ -31,6 +33,7 @@ metrics:
     unit: GiB
     groupby:
       - id
+      - user_id
       - project_id
     metadata:
       - volume_type
@@ -38,24 +41,28 @@ metrics:
       aggregation_method: mean
       resource_type: volume
 
-  network.outgoing.bytes:
+  network.outgoing.bytes.rate:
     unit: MB
     groupby:
       - id
       - project_id
-    factor: 1/1000000
+      - user_id
+    # Converting B/s to MB/h
+    factor: 3600/1000000
     metadata:
       - instance_id
     extra_args:
       aggregation_method: mean
       resource_type: instance_network_interface
 
-  network.incoming.bytes:
+  network.incoming.bytes.rate:
     unit: MB
     groupby:
       - id
       - project_id
-    factor: 1/1000000
+      - user_id
+    # Converting B/s to MB/h
+    factor: 3600/1000000
     metadata:
       - instance_id
     extra_args:
@@ -66,6 +73,7 @@ metrics:
     unit: ip
     groupby:
       - id
+      - user_id
       - project_id
     metadata:
       - state
@@ -78,6 +86,7 @@ metrics:
     unit: GiB
     groupby:
       - id
+      - user_id
       - project_id
     factor: 1/1073741824
     extra_args: