WAF reminded me of the Cloudflare outage on July 2, 2019 due to small regex mistake [1]
[1] https://blog.cloudflare.com/details-of-the-cloudflare-outage...
[1] https://blog.cloudflare.com/details-of-the-cloudflare-outage...
That was already planned at the time of this incident, but this incident accelerated the pace at which the new system was put in place as well as introduced controls and process for the release of waf rules (regardless of what engine they were applied in)