Couple of side notes that are very interesting:

Palo Alto detected the SolarWinds problem early, but failed to notify the Cyber Threat Alliance which it spearheaded, significantly exacerbating the impact: https://www.cfr.org/blog/most-tools-failed-detect-solarwinds...

The PE firm that basically ran SolarWinds into the ground (Thoma Bravo) bought Proofpoint in 2021, not too long after the debacle became public.