trace_profile_events
Enables or disables collecting stacktraces on each update of profile events along with the name of profile event and the value of increment and sending them into trace_log. Possible values:- 1 — Tracing of profile events enabled.
- 0 — Tracing of profile events disabled.
trace_profile_events_list
When the settingtrace_profile_events is enabled, limit the traced events to the specified list of comma-separated names.
If the trace_profile_events_list is an empty string (by default), trace all profile events.
Example value: ‘DiskS3ReadMicroseconds,DiskS3ReadRequestsCount,SelectQueryTimeMicroseconds,ReadBufferFromS3Bytes’
Using this setting allows more precise collection of data for a large number of queries, because otherwise the vast amount of events can overflow the internal system log queue and some portion of them will be dropped.