Seems PrestaShop Eventbus module is making some problems - strangly enough in debug mode it shows no error however for example while trying to change order status I get information like "Unexpected error. [InvalidArgumentException kod 0]: Unsupported Sentry DSN scheme: ". After disabling it metrics do seem to work and no errors so far for 1 day. I believe if you do not like adrenaline you should avoid metrics. From the begining on PS1.6 I had problems with this module and now on 1.782 still some issues.
Sometimes solution is faster than expected - a new eventbus module just occured and changelog says it was the problem:
1.6.5: ## What\\\'s Changed
* fixed sentry key issue with symfony cache by @margud in https://github.com/PrestaShopCorp/ps_eventbus/pull/57
* Fix .env.dist by @jokesterfr in https://github.com/PrestaShopCorp/ps_eventbus/pull/56
* improved sentry exception handle by @margud in https://github.com/PrestaShopCorp/ps_eventbus/pull/58