Welcome notification should have 'system' metrics group

Change-Id: Ia818785ef5afdcaa133109edad05418c4a259269
Add external db support to Echo

Change-Id: I84b0d904795d858d88d8e52c22f00d81c0e81303
Merge "Add external db support to Echo"
Merge "Welcome notification should have 'system' metrics group"