The o11y team has discussed this internally and has decided to sunset Watchmouse as we do not seem to be obtaining great value from Watchmouse as external monitoring. Recent examples in T292603.
Historically the tool was initially used for the public status page and to expose some KPIs for external availability and an external uptime checker. Additional background: T81454, T85829, T89877, T79416
StatusPage effectively replaced Watchmouse recently (See T202061 and T285769), and the new stack is ready for production.
We also have enough redundancy with our existing Icinga and external testing infrastructure to sunset this tool without losing core functionality while reducing the scope of technology to support. In addition, we aim to improve external monitoring as part of plans and roadmap for alerting. However, we will not wait for the new solution's implementation as a dependency for moving forward with this decommission this quarter.