Maintainers for rrdtool are Debian RRDtool Team <team+rrdtool@tracker.debian.org>.
You may want to refer to the following packages that are part of the same source: librrd-dev, librrd8, librrd8t64, librrdp-perl, librrds-perl, lua-rrd, lua-rrd-dev, python-rrdtool, python3-rrdtool, python3-rrdtool-dbg, rrdcached, rrdtool-dbg, rrdtool-tcl, ruby-rrd.
You might like to refer to the rrdtool package page, to the Package Tracking System, or to the source package src:rrdtool's bug page.
If you find a bug not listed here, please report it.