silverstripe-framework/_config/logging.yml

---
Name: logging
---
SilverStripe\Core\Injector\Injector:
  ErrorHandler:
    class: SilverStripe\Logging\MonologErrorHandler
    properties:
      Logger: %$Logger
  Logger:
    type: singleton
    class: Monolog\Logger
    constructor:
      - "error-log"
    calls:
      DisplayErrorHandler: [ pushHandler, [ %$DisplayErrorHandler ] ]

---
Name: dev-logging
Only:
  environment: dev
---
SilverStripe\Core\Injector\Injector:
  DisplayErrorHandler:
    class: SilverStripe\Logging\HTTPOutputHandler
    constructor:
      - "notice"
    properties:
      Formatter: %$SilverStripe\Logging\DetailedErrorFormatter
---
Name: live-logging
Except:
  environment: dev
---
SilverStripe\Core\Injector\Injector:
  DisplayErrorHandler:
    class: SilverStripe\Logging\HTTPOutputHandler
    constructor:
      - "error"
    properties:
      Formatter: %$FriendlyErrorFormatter
  FriendlyErrorFormatter:
    class: SilverStripe\Logging\DebugViewFriendlyErrorFormatter
    properties:
      Title: "There has been an error"
      Body: "The website server has not been able to respond to your request"