Add alert routing

[adrain-cb]

Fixes Issue

Fixes #140

Changes proposed

Screenshots (Optional)

Note to reviewers

[ethenotethan]

Let's also ensure to add:

• Unit tests for new/changed code
• Updated E2E tests to ensure proper config ingestion to alerting flow
• Updated documentation detailing how to use this feature
• A template file that users can copy and quickly fill in

[ethenotethan]

Generally looks a lot better and is certainly shaping up. Think we'll be smooth sailing the review round after this!

[ethenotethan]

Can we also update the alerting documentation to reflect this new abstraction within its architecture diagrams and descriptions?

[ethenotethan]

Just a few knits and this should be good to go. This looks really good, thank you!

[ethenotethan]

LGTM