MySQL Bugs: #80753: Add a counter for dropped events in performance/async modes

Bug #80753	Add a counter for dropped events in performance/async modes
Submitted:	15 Mar 2016 16:08
Reporter:	Mark Leith	Email Updates:
Status:	Verified	Impact on me:	None
Category:	MySQL Server: Security: Audit	Severity:	S4 (Feature request)
Version:	5.6.29	OS:	Any
Assigned to:		CPU Architecture:	Any

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Description:
It is possible in performance/async modes to drop events within the audit log when unable to allocate buffers. This is documented, so not particularly a bug, but it happens invisibly.

There should be a counter to track when this happens, in case memory use can recover and continued monitoring is possible, to alert admins to the problem.

How to repeat:
Run a statement that is larger than the available buffer size

Suggested fix:
Add a counter for "truncated" events.