I'll note that Cloudbees offers commercial support for Jenkins. Having said that, I had a former employer that was a Cloudbees customer and the support we got

I'll note that Cloudbees offers commercial support for Jenkins. Having said that, I had a former employer that was a Cloudbees customer and the support we got was typically "Have you tried turning it off and back on?" That drove us back to OSS Jenkins. Although, AIUI, said employer has now moved to Harness.