Thanks for your feedback & contributions to the collectd project !
Please use the collectd mailing list or the #collectd IRC channel. We'd like to keep the github issue tracker for bugreports and patch reviews.
Please mention the exact collectd version you're using, how it was installed (built from source, or installed from packages. Where was it downloaded from). Which operating system/architecture, distribution and version are you running collectd on.
If collectd crashes, try to get a stack trace.
Using git/github to submit changes is not mandatory. Sending patches to the mailing-list is also fine. In both cases, take a quick look at the submission guidelines and the coding style recommendations.
Please try to submit bugfixes to the oldest release branch on which the bug is found, so that it gets included in every future bugfix release.
Please try to submit new features to the master branch (which will become the next feature release).