Why puma workers constantly hung, and how we fixed by discovering the bug of Ruby v2.5.8 and v2.6.6 | by Yohei Yoshimuta | ITNEXT
puma - Bountysource
Why I get all zero in Puma::Cluster#stats · Issue #721 · puma/puma · GitHub
Monitoring Puma web server with Prometheus and Grafana - DEV Community
Vladimir Dementyev on Twitter: "Played a bit with Action Cable, @any_cable and process-metrics gem by @ioquatix on free Heroku dynos (see thread for more graphics) https://t.co/UVe0TOB9xH" / Twitter
Issues with config file and booting on 4.1.0 · Issue #1922 · puma/puma · GitHub