vmod-dynamic, our #varnishcache module for dynamic backends from #dns (A/CNAME and SRV records) has received some bug fixes and workarounds for issues in Varnish-Cache 7.5 and 7.6.
The new wait_timeout and wait_limits parameters are now supported.
See the changelog for details: https://github.com/nigoroll/libvmod-dynamic/blob/master/CHANGES.rst#76-branch
A release branch for 7.6 has been created: https://github.com/nigoroll/libvmod-dynamic/tree/7.6