created docker-prometheus compose file and edited the Prometheus yml file

prom/retrieval/discovery/fixtures/target_groups.json

@@ -0,0 +1,11 @@
+[
+	{
+		"targets": ["localhost:9090", "example.org:443"],
+		"labels": {
+			"foo": "bar"
+		}
+	},
+	{
+		"targets": ["my.domain"]
+	}
+]

prom/retrieval/discovery/fixtures/target_groups.yml

@@ -0,0 +1,5 @@
+- targets: ['localhost:9090', 'example.org:443']
+  labels:
+    foo: bar
+
+- targets: ['my.domain']