There are many ways to get help from the Apache Pulsar community. The mailing lists are the primary place where all Pulsar committers are present. Bugs and feature requests can either be discussed on the dev mailing list or by opening an issue on GitHub.
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There is a Pulsar slack channel that is used for informal discussions for devs and users.
The Slack instance is at https://apache-pulsar.slack.com/
You can self-register at https://apache-pulsar.herokuapp.com/