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The description shown below is the top answer as voted by the Spotlight community.

The charts are based on 2.1 TB of data collected from 4207 instances uploaded by 323 Spotlight users over an 8 week period.

PWAIT_EVENT_SESSION_INIT_MUTEX

Category: Other
SQL Server versions: 2012, 2014, 2016, 2017

What is PWAIT_EVENT_SESSION_INIT_MUTEX?

Never

This wait has never occurred recently

PWAIT_EVENT_SESSION_INIT_MUTEX has not occurred recently on 4207 instances checked.

Prevalence of PWAIT_EVENT_SESSION_INIT_MUTEX across the Spotlight Population