Provisioning action constant

Added mertrics variable to log provisioning action.
Happens only once, when the device is provisioned.
It shouldn't be more than 10 times for a device's life.

Test: Not required

Bug: 31425628
Bug: 31426356
Change-Id: I254f0232ede6338313084d123b0a06883b82c267
diff --git a/proto/src/metrics_constants.proto b/proto/src/metrics_constants.proto
index 90ccca2..815978e 100644
--- a/proto/src/metrics_constants.proto
+++ b/proto/src/metrics_constants.proto
@@ -2566,9 +2566,12 @@
     // OPEN: Settings > Wireless > Manage wireless plan dialog
     DIALOG_MANAGE_MOBILE_PLAN = 609;
 
-    // ACTION: Logs the network type of device while provisioning
+    // ACTION: Logs network type of the device while provisioning
     PROVISIONING_NETWORK_TYPE = 610;
 
+    // ACTION: Logs action which triggered provisioning.
+    PROVISIONING_ACTION = 611;
+
     // ---- End O Constants, all O constants go above this line ----
 
     // Add new aosp constants above this line.