Startup and shutdown logs not json

[mika018]

At the moment startup and shutdown logs are not in json format:

=> Booting Puma
=> Rails 5.2.6 application starting in production 
=> Run `rails server -h` for more startup options
{"level":"INFO","ts":"2021-11-23T10:04:36.947Z","message":"Raven 3.1.2 ready to catch errors","rails":{"environment":"production"}}
Puma starting in single mode...
* Puma version: 5.5.1 (ruby 2.6.6-p146) ("Zawgyi")
*  Min threads: 0
*  Max threads: 5
*  Environment: production
*          PID: 1
* Listening on http://0.0.0.0:3000
Use Ctrl-C to stop

and

- Gracefully stopping, waiting for requests to finish
Exiting
``

We would like them as json so that they get through to kibana and we know whether the application shut down gracefully.