Add prometheus metrics to alloy

playbooks/filter_plugins/alloy.py

@@ -0,0 +1,44 @@
+def transfer_optional_param(source, target, name, target_name=None):
+    if param := source.get(name):
+        target[target_name or name] = param
+
+class FilterModule(object):
+    def filters(self):
+        return {
+            'services_to_alloy': self.services_to_alloy,
+        }
+
+    def services_to_alloy(self, services):
+        result = []
+
+        for name, service in services.items():
+            if not bool(service.get("host")):
+                continue
+
+            if targets := service.get("metrics") or []:
+                job = {
+                    "name": name,
+                    "targets": [],
+                    "scrape_interval": "60s",
+                }
+
+                for target in targets:
+
+                    address = target.get("address") or service["dns"][0]['domain']
+
+                    transfer_optional_param(target, job, "interval", "scrape_interval")
+
+                    new_target = {
+                        "address": address,
+                        "path": target["path"],
+                        "instance": name
+                    }
+
+                    transfer_optional_param(target, new_target, "instance")
+                    transfer_optional_param(target, new_target, "job")
+
+                    job["targets"].append(new_target)
+
+                result.append(job)
+
+        return result