[Bug 1811098] Fix included in openstack/ceilometer 12.0.0.0rc1

[OpenStack Infra]

This issue was fixed in the openstack/ceilometer 12.0.0.0rc1 release
candidate.

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https://bugs.launchpad.net/bugs/1811098

Title:
  [SRU] ceilometer writing snmp credentials to log file

Status in Ceilometer:
  In Progress
Status in Ubuntu Cloud Archive:
  Fix Released
Status in Ubuntu Cloud Archive ocata series:
  Triaged
Status in Ubuntu Cloud Archive pike series:
  Triaged
Status in Ubuntu Cloud Archive queens series:
  Fix Released
Status in Ubuntu Cloud Archive rocky series:
  Fix Released
Status in Ubuntu Cloud Archive stein series:
  Fix Released
Status in ceilometer package in Ubuntu:
  Fix Released
Status in ceilometer source package in Bionic:
  Fix Released
Status in ceilometer source package in Cosmic:
  Fix Released
Status in ceilometer source package in Disco:
  Fix Released

Bug description:
  [Impact] 
  This SRU proposal is to patch the Ubuntu ceilometer package so that the ceilometer-agent switches printing the contents of polling.yaml from INFO to DEBUG. This is mostly an interim fix to make it easy to stop the presence of sensitive data in the ceilometer logfiles when DEBUG logging is not activated. Another bug will be raised to propose sanitising the data printed.

  [Test Case]
  * deploy Openstack Q/R/S with ceilometer
  * enable debug logging
  * check that /var/log/ceilometer/ceilometer-agent-central.log contains a line similar to:

  2019-01-09 11:40:50.641 25495 DEBUG ceilometer.agent [-] Config file:
  {'sources': [{'interval': 300, 'meters'...

  i.e. ensure that the log is printed using DEBUG (not INFO)

  [Regression Potential]
  Users with debug mode disabled will no longer see this line.

  ----

  The ceilometer-agent-central is always writing the contents of
  polling.yaml to its log file (and as INFO) [1]

  This presents a security risk if e.g. resources contain sensitive
  information like when specifying snmp targets with the url containing
  the username, password etc.

  There are a couple of ways we could solve this, namely; (1) don't log
  this info at all, (2) sanitise the contents prior to logging as DEBUG
  (3) switch to using config for the snmp credentials in a similar way
  to how the Triple0Discoverer does it [2] - this would only support
  having the same creds everywhere thought which may not be desirable.

  [1] https://github.com/openstack/ceilometer/blob/stable/rocky/ceilometer/agent.py#L70
  [2] https://github.com/openstack/ceilometer/blob/stable/rocky/ceilometer/hardware/discovery.py#L24

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