Turn off Caddy's admin interface and expose metrics on the same port.

conf/Caddyfile

@@ -9,6 +9,16 @@
 }
 
 {
+	storage s3 {
+		host "{env.PAGES_STORAGE_S3_ENDPOINT}"
+		access_id "{env.PAGES_STORAGE_S3_ACCESS_KEY_ID}"
+		secret_key "{env.PAGES_STORAGE_S3_SECRET_ACCESS_KEY}"
+		bucket "{env.PAGES_STORAGE_S3_BUCKET}"
+		prefix "ssl"
+	}
+
+	admin off
+
 	persist_config off
 
 	log {
@@ -20,17 +30,7 @@
 		}
 	}
 
-	metrics {
-		per_host
-	}
-
-	storage s3 {
-		host "{env.PAGES_STORAGE_S3_ENDPOINT}"
-		access_id "{env.PAGES_STORAGE_S3_ACCESS_KEY_ID}"
-		secret_key "{env.PAGES_STORAGE_S3_SECRET_ACCESS_KEY}"
-		bucket "{env.PAGES_STORAGE_S3_BUCKET}"
-		prefix "ssl"
-	}
+	metrics
 
 	email {env.ACME_EMAIL}
 
@@ -61,6 +61,11 @@
 		name health
 		protocols h1
 	}
+
+	servers :2019 {
+		name metrics
+		protocols h1
+	}
 }
 
 (backend) {
@@ -98,3 +103,7 @@ https:// {
 http://localhost:2002 {
 	reverse_proxy http://localhost:3002
 }
+
+http://:2019 {
+	metrics
+}

fly.toml

@@ -18,7 +18,6 @@ cpus = 2
 memory = 512
 
 [env]
-CADDY_ADMIN = ":2019"
 UDP_BIND_TO = "fly-global-services"
 ALLOW_PROXY = "172.16.0.0/16"
 AUTOMEMLIMIT = "0.25"