[automerger skipped] Log metrics for RKP fallback event. am: ac057d3a99 -s ours

am skip reason: skipped by user hasinitg

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/security/+/15433979

Change-Id: Ie2268c34f43157eae48fb5f8a3006f8252e0262a