Martijn van Groningen 0890001470 stats: Add queued watches metric
The queued watches metric gives insight into the watches that are queued for execution.
Per watch that is queued, executing information is shared, like the `watch_id`,
when the watch was triggered and when execution started.

Original commit: elastic/x-pack-elasticsearch@deb5ddfde2
2015-05-31 11:13:13 +02:00
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