Training: Microservices

[amaltaro]

Impact of the new feature
WM in general

Is your feature request related to a problem? Please describe.
Sharing knowledge and empowering WM/Ops to understand and debug the system. Sub-task of #11837

Describe the solution you'd like
Topic of this ticket is: Microservices.

We should cover details of each of the WM microservices:

• MSTransferor
• MSMonitor
• MSRuleCleaner
• MSOutput
• MSPileup

including core functionality, REST APIs, number of replicas, threads, dependencies and so on.

For the expected solution, please refer to the meta-issue for further details (in short: documentation + recorded presentation).

Describe alternatives you've considered
None

Additional context
None

[amaltaro]

This training took place yesterday and here is the indico link: https://indico.cern.ch/event/1423996/

In addition, documentation has been provided (and updated) with this PR: https://gitlab.cern.ch/dmwm/wmcore-docs/-/merge_requests/39

@vkuznet I understand that there is nothing else pending with this ticket, but please reopen it in case we are still missing something. Thanks!