Fix up some typechecking (#6150)

* type checking fixes

* changelog

2 files changed, 4 insertions, 4 deletions

diff --git a/synapse/metrics/__init__.py b/synapse/metrics/__init__.py

index bec3b13397..0b45e1f52a 100644
--- a/synapse/metrics/__init__.py
+++ b/synapse/metrics/__init__.py
@@ -125,7 +125,7 @@ class InFlightGauge(object):
         )
 
         # Counts number of in flight blocks for a given set of label values
-        self._registrations = {}
+        self._registrations = {}  # type: Dict
 
         # Protects access to _registrations
         self._lock = threading.Lock()
@@ -226,7 +226,7 @@ class BucketCollector(object):
         # Fetch the data -- this must be synchronous!
         data = self.data_collector()
 
-        buckets = {}
+        buckets = {}  # type: Dict[float, int]
 
         res = []
         for x in data.keys():
diff --git a/synapse/metrics/_exposition.py b/synapse/metrics/_exposition.py

index 74d9c3ecd3..a248103191 100644
--- a/synapse/metrics/_exposition.py
+++ b/synapse/metrics/_exposition.py
@@ -36,9 +36,9 @@ from twisted.web.resource import Resource
 try:
     from prometheus_client.samples import Sample
 except ImportError:
-    Sample = namedtuple(
+    Sample = namedtuple(  # type: ignore[no-redef] # noqa
         "Sample", ["name", "labels", "value", "timestamp", "exemplar"]
-    )  # type: ignore
+    )
 
 
 CONTENT_TYPE_LATEST = str("text/plain; version=0.0.4; charset=utf-8")