Pingdom continues to alert when critical alerts are acked

[efinlay24]

In CoCo, acking a service in aggregate-healthcheck removed critical from the healthcheck page.

In k8s, the healthcheck page continues to say critical acked.

This causes Pingdom alerts to fail even when we have an alert acked, as it checks specifically for the string critical.

We should either:

• revert back to the old behaviour
• rethink our Pingdom checks to avoid this problem

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https://trello.com/c/R1rM5byf/155-pingdom-continues-to-alert-when-critical-alerts-are-acked