How do we communicate? forum (egroups, slack, etc)? Dedicated meetings? hackathon?

Find the expert: where can I see what expert can I ask about tool/data format XYZ?

• E.g. I’d like to learn about Rucio traces, what to find in them, and maybe also take some example of the already done analytics ...
  ⇒ rudimentary doc (it doesn’t have to be perfect!)? List of experts with areas?

List of open problems ⇒ to attract potential contributors

• Collect "challenges", their impact and possible improvements