I believe in giving credit where credit is due.
I recently installed the http2 apache module to provide http2 support on our web server. After installation I would see processes get stuck in graceful restart after the nightly graceful restart for log rotation.
I submitted a bug report on bugzilla.
Two days later I got e-mail with an explanation of what caused the problem and a fix. I compiled and installed the new http2 module today and it indeed did fix it.
This is on an Open Source project where people are doing this work gratis. I’d never see that kind of support from Microsoft or Apple where hundreds of people are getting paid to develop.