[parent issue] Apache Pulsar related open topics

just to have a good overview on all Pulsar related open topics,
and only filtering for "pulsar" does not give the right picture, because many issues just mention Pulsar in code blocks or as example,
this is a manual build list:
- [x] #14567
- [x] #13880
- [x] #13317
- [x] #13008
- [x] #8537
- [x] #14543
- [ ] #8806
- [ ] #8234
- [ ] #7298

open pull request:
- [ ] #8235
- [ ] #11561
- [ ] #14397
- [ ] #14857

Review the checklist in issue #13010 together with the referenced issues #14567, #13880, #13317, #13008, #8537, #14543, #8806, #8234, and #7298. Also check the listed pull requests #8235, #11561, #14397, and #14857; the overview is complete when the manual list accurately reflects the referenced topics and pull-request status.

Written by the indexing model from the issue text.