acme-challenge GET request every 10-ish seconds

My application receives a GET /.well-known/acme-challenge/... request every 10-ish seconds for a long time already.

Here’s an example of a few of them:

 2024-03-28T07:07:37.269 app[9080173a159418] ams [info] GET /.well-known/acme-challenge/CIioEenzS7kYD0M1bdxR1FrspFQ8JbxUVAARhwaDrgE 404 - - 0.863 ms

2024-03-28T07:07:47.305 app[9080173a159418] ams [info] GET /.well-known/acme-challenge/CIioEenzS7kYD0M1bdxR1FrspFQ8JbxUVAARhwaDrgE 404 - - 1.475 ms

2024-03-28T07:07:57.333 app[9080173a159418] ams [info] GET /.well-known/acme-challenge/CIioEenzS7kYD0M1bdxR1FrspFQ8JbxUVAARhwaDrgE 404 - - 0.981 ms

2024-03-28T07:08:07.359 app[9080173a159418] ams [info] GET /.well-known/acme-challenge/CIioEenzS7kYD0M1bdxR1FrspFQ8JbxUVAARhwaDrgE 404 - - 0.925 ms

2024-03-28T07:08:17.401 app[9080173a159418] ams [info] GET /.well-known/acme-challenge/CIioEenzS7kYD0M1bdxR1FrspFQ8JbxUVAARhwaDrgE 404 - - 0.834 ms

2024-03-28T07:08:27.439 app[9080173a159418] ams [info] GET /.well-known/acme-challenge/CIioEenzS7kYD0M1bdxR1FrspFQ8JbxUVAARhwaDrgE 404 - - 1.533 ms 

All certificate options show the green light in the dashboard, including the domain ownership verification that uses the _acme-challenge CNAME record.

Does anyone know why my app gets these requests?

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