Hendrik Muhs e9f8442bee
[ML] Return statistics about forecasts as part of the jobsstats and usage API (#31647)
This change adds stats about forecasts, to the jobstats api as well as xpack/_usage. The following 
information is collected:

_xpack/ml/anomaly_detectors/{jobid|_all}/_stats:

 -  total number of forecasts
 -  memory statistics (mean/min/max)
 -  runtime statistics
 -  record statistics
 -  counts by status

_xpack/usage

 -  collected by job status as well as overall (_all):
     -  total number of forecasts
     -  number of jobs that have at least 1 forecast
     -  memory, runtime, record statistics
     -  counts by status

Fixes #31395
2018-07-04 08:15:45 +02:00
..
2018-04-20 15:33:59 -07:00

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