[feat] add observability runtime

adapter/observability/noop.py

@@ -0,0 +1,54 @@
+from types import TracebackType
+
+from usecase.interface import Attrs, AttrValue
+
+
+class NoopMetrics:
+    def increment(
+        self,
+        name: str,
+        value: int = 1,
+        attrs: Attrs | None = None,
+    ) -> None:
+        return None
+
+    def record(
+        self,
+        name: str,
+        value: float,
+        attrs: Attrs | None = None,
+    ) -> None:
+        return None
+
+
+class NoopSpan:
+    def set_attribute(self, name: str, value: AttrValue) -> None:
+        return None
+
+    def record_error(self, error: Exception) -> None:
+        return None
+
+
+class NoopSpanContext:
+    def __init__(self) -> None:
+        self._span = NoopSpan()
+
+    def __enter__(self) -> NoopSpan:
+        return self._span
+
+    def __exit__(
+        self,
+        exc_type: type[BaseException] | None,
+        exc: BaseException | None,
+        traceback: TracebackType | None,
+    ) -> bool | None:
+        return None
+
+
+class NoopTracer:
+    def start_span(
+        self,
+        name: str,
+        attrs: Attrs | None = None,
+    ) -> NoopSpanContext:
+        return NoopSpanContext()