Merge tag '0.5.0' into debian/zed

oslo.metrics 0.5.0 release

meta:version: 0.5.0
meta:diff-start: -
meta:series: zed
meta:release-type: release
meta:pypi: yes
meta:first: yes
meta:release:Author: Elod Illes <elod.illes@est.tech>
meta:release:Commit: Előd Illés <elod.illes@est.tech>
meta:release:Change-Id: I65e4b1ffde65ae0af5e69d53c9b8820bfd760679
meta:release:Code-Review+1: Daniel Bengtsson <dbengt@redhat.com>
meta:release:Code-Review+2: Hervé Beraud <herveberaud.pro@gmail.com>
meta:release:Code-Review+2: Elod Illes <elod.illes@est.tech>
meta:release:Workflow+1: Elod Illes <elod.illes@est.tech>