1 files changed, 2 insertions, 0 deletions
diff --git a/synapse/metrics/__init__.py b/synapse/metrics/__init__.py
index 8ce5887229..39fc629937 100644
--- a/synapse/metrics/__init__.py
+++ b/synapse/metrics/__init__.py
@@ -77,6 +77,8 @@ RegistryProxy = cast(CollectorRegistry, _RegistryProxy)
 
 @attr.s(slots=True, hash=True, auto_attribs=True)
 class LaterGauge(Collector):
+    """A Gauge which periodically calls a user-provided callback to produce metrics."""
+
     name: str
     desc: str
     labels: Optional[Sequence[str]] = attr.ib(hash=False)