neutron/releasenotes/notes/process-manager-tag-2181918...

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The ``ProcessManager`` class will now, by default, add an environment
variable when starting a new process. This default tag is named
"PROCESS_TAG" and will contain a unique identifier for this specific
process. It could be used, for example, by TripleO to univocally tag
any new container spawned and find it using the same tag.