Add Monolog integration to allow output to go anywhere.

[jonpugh]

The monolog PHP library makes it very easy to follow PSRx logging standards and make log storage pluggable: https://symfony.com/doc/current/logging.html

Monolog has a concept of "Handlers" that aloows logs to be easily piped to almost any system.

• files
• stream
• console
• mongo
• elasticsearch
• redis
• syslog
• socket
• newrelic
• slack
• etc!

See the full list here: https://github.com/symfony/monolog-bundle/blob/master/DependencyInjection/Configuration.php#L25

Jon did some proof of concept work in Provision CLI: https://github.com/provision-ops/provision/pull/12

The monolog integration might need to be in both power-process and in Yaml-tests, but in the end, it's just a replacement for Symfony ConsoleOutput, so it should become it's own plugin.

The new plugin could be used in any app to override standard Output to pipe to monolog instead.

[jonpugh]

For example, logs can go straight to slack: