Add new events to PinStorage metrics

Bug: 189150063
Test: manual
Change-Id: Icfec305db6bed56ab520612444bafa2c5a9f0b27
Merged-In: Icfec305db6bed56ab520612444bafa2c5a9f0b27
(cherry picked from commit 33047c70700d179d7eb4cc835f7bbce902a5b51b)
1 file changed
tree: b15454186ca0a26aad88c33c38c4295d4c52ba67
  1. stats/
  2. OWNERS