My functional storefront was not active for the last few weeks to prevent unnecessary costs while launching the company. This back-end has been healthy and functional without issue to this point. I redeploy a previously functional back-end and receive the following message:
"====================

Starting Healthcheck

====================

Path: /health

Retry window: 12m0s

Attempt #1 failed with service unavailable. Continuing to retry for 11m49s

Attempt #2 failed with service unavailable. Continuing to retry for 11m38s

Attempt #3 failed with service unavailable. Continuing to retry for 11m26s

Attempt #4 failed with service unavailable. Continuing to retry for 11m12s

Attempt #5 failed with service unavailable. Continuing to retry for 10m54s

Attempt #10 failed with service unavailable. Continuing to retry for 8m28s

Attempt #11 failed with service unavailable. Continuing to retry for 7m48s

Attempt #12 failed with service unavailable. Continuing to retry for 7m8s

Attempt #13 failed with service unavailable. Continuing to retry for 6m28s

Attempt #14 failed with service unavailable. Continuing to retry for 5m48s

Attempt #16 failed with service unavailable. Continuing to retry for 4m31s

Attempt #17 failed with service unavailable. Continuing to retry for 3m51s

Attempt #18 failed with service unavailable. Continuing to retry for 3m10s

Attempt #19 failed with service unavailable. Continuing to retry for 2m30s

Attempt #20 failed with service unavailable. Continuing to retry for 1m50s

Attempt #21 failed with service unavailable. Continuing to retry for 1m10s

Attempt #22 failed with service unavailable. Continuing to retry for 30s

1/1 replicas never became healthy!

Healthcheck failed!"

What caused my previously healthy back-end to become unhealthy and fail the healthcheck? Nothing in my project has changed.