Exposes Sentry\Monolog\Handler service for easier monolog configuration.

[phpeek]

I ❤️ using this bundle.

This PR solves one problem that's still cumbersome to me.

sentry/sentry ships with Sentry\Monolog\Handler for smooth integration with monolog, however this bundle is not exposing it as a service making integration more difficult.

My PR configures Sentry\Monolog\Handler as a service, which - in theory - should simplify configuration.

I've updated example for reference, but it's commented out since not everyone might like it configured out-of-the-box.

[phpeek]

Second option of integration is via https://github.com/getsentry/raven-php, but it's marked as deprecated.

[Jean85]

This seems an interesting addition, which would create no downsides if it's not used.

I would add some tests to check for the existence of the service definition, and instead of adding that to the examples, I would add that in the readme!

[phpeek]

Good idea. Will do that later today. Thanks for looking at this !

[phpeek]

I've added test You've requested, but it's failing due to a valid reason.

If someone would install this bundle without having monolog installed, exposing Handler as a service would fail due to lack of the class Monolog\Handler\AbstractProcessingHandler that is being extended.

sentry/sentry has monolog/monolog dependency but it's a dev one - which is valid.

Will wait for Your feedback, but I'm leaning towards closing this PR.

[Jean85]

Surely defining that service every time would be bad for sure. Instead of closing, maybe we can reroute this to a README-only PR? You could suggest the service definition there too.

[phpeek]

As suggested, I've updated only README.md with optional instructions on how to setup monolog handler.

[Jean85]

Thanks!

[pbowyer]

Doesn't this need to be

monolog:
    handlers:
        sentry:

?

[Jean85]

Oh right! #230