Add "test alerting" on Slack

[Maayan-s]

Slack alerts are only sent if there are failed tests.
When users deploy Elementary, they want to have a way to validate the deployment worked.
We should have a flag for validating the deployment.

[ronmorgen1]

Looks interesting I would be happy to take this. How would you classify a successful deployment?

[Maayan-s]

@ronmorgen1

Important background - the CLI has an internal dbt project. This project queries the Elementary tables from the dbt package deployment.
So the flow is:

1. User installs the dbt package, that collects data to an elementary schema
2. The CLI has an internal dbt project, with a profile pointing at the elementary schema
3. The CLI dbt project runs and reads data that should be sent as alerts
4. The CLI sends alerts to Slack

So a successful deployment means that the elementary schema exists, the CLI can read from it (the profile is well configured), and the CLI can find a Slack config and send a message.

[ronmorgen1]

@Maayan-s

I see. So after the CLI installation when the user runs the command edt monitor, a slack message is sent only when tests fail, and now we want to send one when deployment is successful (?)

[Maayan-s]

@ronmorgen1

I think we should probably have a --test flag.
The use case here is that you install but don't have any failed tests at the moment, but you still want to make sure the deployment actually works.

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[elongl]

Added as edr monitor --test.

 --test BOOLEAN                  Whether to send a test message in case there
                                  are no alerts.