6ea362da0b
The prometheus datasource was reporting host_ram_usage in MiB as
described in the docstring for the base datasource interface
definition [1].
However, the gnocchi datasource is reporting it in KiB following
ceilometer metric `hardware.memory.used` [2] and the strategies
using that metric expect it to be in KiB so the best approach is
to change the unit in the prometheus datasource and update the
docstring to avoid missunderstandings in future. So, this patch
is fixing the prometheus datasource to return host_ram_usage
in KiB instead of MiB.
Additionally, it is adding more unit tests for the check_threshold
method so that it covers the memory based strategy execution, validates
the calculated standard deviation and adds the cases where it is below
the threshold.
[1] 15981117ee/watcher/decision_engine/datasources/base.py (L177-L183)
[2] https://docs.openstack.org/ceilometer/train/admin/telemetry-measurements.html#snmp-based-meters
Closes-Bug: #2113776
Change-Id: Idc060d1e709c0265c64ada16062c3a206c6b04fa
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Watcher
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.. image:: https://governance.openstack.org/tc/badges/watcher.svg
:target: https://governance.openstack.org/tc/reference/tags/index.html
.. Change things from this point on
..
Except where otherwise noted, this document is licensed under Creative
Commons Attribution 3.0 License. You can view the license at:
https://creativecommons.org/licenses/by/3.0/
OpenStack Watcher provides a flexible and scalable resource optimization
service for multi-tenant OpenStack-based clouds.
Watcher provides a robust framework to realize a wide range of cloud
optimization goals, including the reduction of data center
operating costs, increased system performance via intelligent virtual machine
migration, increased energy efficiency and more!
* Free software: Apache license
* Wiki: https://wiki.openstack.org/wiki/Watcher
* Source: https://opendev.org/openstack/watcher
* Bugs: https://bugs.launchpad.net/watcher
* Documentation: https://docs.openstack.org/watcher/latest/
* Release notes: https://docs.openstack.org/releasenotes/watcher/
* Design specifications: https://specs.openstack.org/openstack/watcher-specs/