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fixes:
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The prometheus openstack exporters are now behind haproxy,
providing a unique time series in the prometheus database.
Also ensures that only one exporter queries
the openstack APIs at any given time interval.
With the previous behavior each openstack exporter
was scraped at the same time.
This caused each exporter to query the openstack APIs
simultaneously introducing unneccesary load and duplicate
time series in the prometheus database due to the instance
label being unique for each exporter.
`LP#1972818 <https://bugs.launchpad.net/kolla-ansible/+bug/1972818>`__
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