MySQL 8.0 Release Notes
MySQL 8.0 Source Code Documentation
These views summarize statement stages, grouped by host. By default, rows are sorted by host and descending total latency.
The host_summary_by_stages and
x$host_summary_by_stages views
have these columns:
hostThe host from which the client connected. Rows for which the
HOSTcolumn in the underlying Performance Schema table isNULLare assumed to be for background threads and are reported with a host name ofbackground.event_nameThe stage event name.
totalThe total number of occurrences of the stage event for the host.
total_latencyThe total wait time of timed occurrences of the stage event for the host.
avg_latencyThe average wait time per timed occurrence of the stage event for the host.