Update the suffix to sum

Co-authored-by: Junqi Zhao <[email protected]>

Author: solenoci

Documentation/data-collection.md

@@ -1270,14 +1270,14 @@ data:
     #
     # owners: (https://github.com/kubev2v/forklift)
     #
-    # cluster:mtv_migrations_status_total:max is the total number of VM migrations running on the cluster,
+    # cluster:mtv_migrations_status_total:sum is the total number of VM migrations running on the cluster,
     # labeled with {status}, {provider}, {mode}, and {target}.
     # Expected labels:
     # - provider: "ova", "vsphere", "openstack", "openshift", "ovirt" or "awsec2"
     # - target: "Local" or "Remote"
     # - mode: "Cold", "Warm" or "RCM"
     # - status: "Suceeded", "Failed" or "Canceled"
-    - '{__name__="cluster:mtv_migrations_status_total:max", provider=~"ova|vsphere|openstack|openshift|ovirt|awsec2", target=~"Local|Remote", mode=~"Cold|Warm|RCM", status=~"Succeeded|Failed|Canceled"}'
+    - '{__name__="cluster:mtv_migrations_status_total:sum", provider=~"ova|vsphere|openstack|openshift|ovirt|awsec2", target=~"Local|Remote", mode=~"Cold|Warm|RCM", status=~"Succeeded|Failed|Canceled"}'
 kind: ConfigMap
 metadata:
   name: telemetry-config