At first, it was only for developers, actionable metrics were: number of red CI jobs, distribution of build times (especially 90th, 99th percentiles), number of open pull requests.

Now each team has their own dashboard. E.g support team shows a graph of open/assigned/outstanding tickets, with SLA breaches highlighted. Sales team shows a sum up of data anomalies in their CRM (missing data, inconsistent states).

The rationale is that anything that shows up in red needs immediate action from a human being to avoid blocking the team, and we strive for the right balance between always green and always red (which are both useless states).