https://bugzilla.wikimedia.org/show_bug.cgi?id=69854

[email protected] changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |WONTFIX

--- Comment #2 from [email protected] ---
Monitoring worked as expected, as the data is missing sequence numbers:

 
+-----------------------------+-----------+---------------------+---------------------+
  | Hostname                    | # missing | Start time          | End time   
        |
 
+-----------------------------+-----------+---------------------+---------------------+
  | amssq37.esams.wmnet         |       155 | 2014-08-18T13:29:37 |
2014-08-18T13:29:39 |
  | amssq47.esams.wmnet         |       125 | 2014-08-18T13:29:37 |
2014-08-18T13:29:39 |
  | amssq48.esams.wikimedia.org |       149 | 2014-08-18T13:29:37 |
2014-08-18T13:29:39 |
  | amssq59.esams.wikimedia.org |        74 | 2014-08-18T13:29:37 |
2014-08-18T13:29:39 |
  | cp1052.eqiad.wmnet          |        96 | 2014-08-18T13:29:38 |
2014-08-18T13:29:39 |
  | cp4008.ulsfo.wmnet          |       173 | 2014-08-18T13:29:37 |
2014-08-18T13:29:38 |
 
+-----------------------------+-----------+---------------------+---------------------+
  | Total                       |       772 | 2014-08-18T13:29:37 |
2014-08-18T13:29:39 |
 
+-----------------------------+-----------+---------------------+---------------------+

Those hosts are all text caches, but are not limited to a datacenter.

The affect timespan, matches a leader re-election.
See attachment kafka-requests-per-second-2014-08-17--2014-08-19.

There goes kafka's "at least once" guarantee :-D

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