26.4.3.4 The host_summary_by_stages and x$host_summary_by_stages Views

These views summarize statement stages, grouped by host. By default, rows are sorted by host and descending total latency.

host

The host from which the client connected. Rows for which the HOST column in the underlying Performance Schema table is NULL are assumed to be for background threads and are reported with a host name of background.
event_name

The stage event name.
total

The total number of occurrences of the stage event for the host.
total_latency

The total wait time of timed occurrences of the stage event for the host.
avg_latency

The average wait time per timed occurrence of the stage event for the host.