$ docker run --rm -p8000:80 cortexproject/cortex:master-5578eeb -target=configs -configs.database.uri=memory://
level=info ts=2023-06-05T17:11:21.943969Z caller=main.go:193 msg="Starting Cortex" version="(version=1.13.0, branch=master, revision=5578eeb)"
level=info ts=2023-06-05T17:11:21.944369Z caller=server.go:260 http=[::]:80 grpc=[::]:9095 msg="server listening on addresses"
level=info ts=2023-06-05T17:11:21.948459Z caller=module_service.go:64 msg=initialising module=server
level=info ts=2023-06-05T17:11:21.950176Z caller=module_service.go:64 msg=initialising module=configs
level=info ts=2023-06-05T17:11:21.950239Z caller=cortex.go:400 msg="Cortex started"
level=error ts=2023-06-05T17:11:24.003665Z caller=api.go:186 msg="invalid rules" err="unsupported rule format version 0"

curl -v  -XPOST -d '{"alertmanager_config":"{\"receivers\":[{\"name\":\"empty\"}],\"route\":{\"receiver\":\"empty\"}}","rules_files":{},"template_files":{}}' -H 'X-Scope-OrgID: fake' http://127.0.0.1:8000/api/prom/configs/alertmanager

< HTTP/1.1 400 Bad Request
< Content-Type: text/plain; charset=utf-8
< X-Content-Type-Options: nosniff
< Date: Mon, 05 Jun 2023 17:11:24 GMT
< Content-Length: 49
<
Invalid rules: unsupported rule format version 0

$ docker run --rm -p8000:80 cortexproject/cortex:master-c930bd6 -target=configs -configs.database.uri=memory://
level=info ts=2023-06-05T17:16:35.41202Z caller=main.go:193 msg="Starting Cortex" version="(version=1.13.0, branch=master, revision=c930bd6)"
level=info ts=2023-06-05T17:16:35.413964Z caller=server.go:260 http=[::]:80 grpc=[::]:9095 msg="server listening on addresses"
level=info ts=2023-06-05T17:16:35.418405Z caller=module_service.go:64 msg=initialising module=server
level=info ts=2023-06-05T17:16:35.420625Z caller=module_service.go:64 msg=initialising module=configs
level=info ts=2023-06-05T17:16:35.422841Z caller=cortex.go:400 msg="Cortex started"

$ curl -v  -XPOST -d '{"alertmanager_config":"{\"receivers\":[{\"name\":\"empty\"}],\"route\":{\"receiver\":\"empty\"}}","rules_files":{},"template_files":{}}' -H 'X-Scope-OrgID: fake' http://127.0.0.1:8000/api/prom/configs/alertmanager
Note: Unnecessary use of -X or --request, POST is already inferred.
*   Trying 127.0.0.1:8000...
* Connected to 127.0.0.1 (127.0.0.1) port 8000 (#0)
> POST /api/prom/configs/alertmanager HTTP/1.1
> Host: 127.0.0.1:8000
> User-Agent: curl/7.87.0
> Accept: */*
> X-Scope-OrgID: fake
> Content-Length: 136
> Content-Type: application/x-www-form-urlencoded
>
* Mark bundle as not supporting multiuse
< HTTP/1.1 204 No Content
< Date: Mon, 05 Jun 2023 17:20:00 GMT
<
* Connection #0 to host 127.0.0.1 left intact

$ docker run --rm -p8000:80 cortexproject/cortex:master-d988472 -target=configs -configs.database.uri=memory://
Unable to find image 'cortexproject/cortex:master-d988472' locally
master-d988472: Pulling from cortexproject/cortex
f56be85fc22e: Already exists
f93ec6642e04: Pull complete
aa4e4b25d019: Pull complete
78bd25eac331: Pull complete
Digest: sha256:8bcbadaaf6e77107fad6fcb5f8a2d16c2240c78ba4aadf464f14759456a1fe7f
Status: Downloaded newer image for cortexproject/cortex:master-d988472
ts=2023-06-05T17:24:04.779773Z caller=main.go:201 level=info msg="Starting Cortex" version="(version=1.15.1, branch=master, revision=d988472)"
ts=2023-06-05T17:24:04.781333Z caller=server.go:323 level=info http=[::]:80 grpc=[::]:9095 msg="server listening on addresses"
ts=2023-06-05T17:24:04.786709Z caller=module_service.go:64 level=info msg=initialising module=server
ts=2023-06-05T17:24:04.790977Z caller=module_service.go:64 level=info msg=initialising module=configs
ts=2023-06-05T17:24:04.791389Z caller=cortex.go:422 level=info msg="Cortex started"
ts=2023-06-05T17:24:16.082692Z caller=api.go:186 level=error msg="invalid rules" err="unsupported rule format version 0"

curl -v  -d '{}' -H 'X-Scope-OrgID: fake' http://127.0.0.1:8000/api/prom/configs/alertmanager