feat(telemetry): expose compute pipeline stage metrics

deploy/telemetry-plane/normalizer/normalizer.py

@@ -151,7 +151,7 @@ def _normalize(topic: str, payload: bytes) -> tuple[object, ...]:
         observed_value = document.get("observed_at_utc")
         measurement = kind
     elif (
-        kind == "host"
+        kind in {"host", "pipeline"}
         and isinstance(document.get("name"), str)
         and isinstance(document.get("fields"), dict)
     ):
@@ -160,6 +160,8 @@ def _normalize(topic: str, payload: bytes) -> tuple[object, ...]:
         measurement = document["name"].strip()
         if not measurement or len(measurement) > 128:
             raise ValueError("Telegraf measurement name is required")
+        if kind == "pipeline" and measurement != "missioncore_pipeline":
+            raise ValueError("Telegraf pipeline measurement is not recognized")
     else:
         raise ValueError("payload schema does not match topic kind")
     node_id = document.get("node_id") or _tag_text(document, "node_id")