diff --git a/synapse/metrics/__init__.py b/synapse/metrics/__init__.py
index 6035672698..2643380d9e 100644
--- a/synapse/metrics/__init__.py
+++ b/synapse/metrics/__init__.py
@@ -51,7 +51,7 @@ all_gauges = {} # type: Dict[str, Union[LaterGauge, InFlightGauge, BucketCollec
HAVE_PROC_SELF_STAT = os.path.exists("/proc/self/stat")
-class RegistryProxy(object):
+class RegistryProxy:
@staticmethod
def collect():
for metric in REGISTRY.collect():
@@ -60,7 +60,7 @@ class RegistryProxy(object):
@attr.s(hash=True)
-class LaterGauge(object):
+class LaterGauge:
name = attr.ib(type=str)
desc = attr.ib(type=str)
@@ -100,7 +100,7 @@ class LaterGauge(object):
all_gauges[self.name] = self
-class InFlightGauge(object):
+class InFlightGauge:
"""Tracks number of things (e.g. requests, Measure blocks, etc) in flight
at any given time.
@@ -206,7 +206,7 @@ class InFlightGauge(object):
@attr.s(hash=True)
-class BucketCollector(object):
+class BucketCollector:
"""
Like a Histogram, but allows buckets to be point-in-time instead of
incrementally added to.
@@ -269,7 +269,7 @@ class BucketCollector(object):
#
-class CPUMetrics(object):
+class CPUMetrics:
def __init__(self):
ticks_per_sec = 100
try:
@@ -329,7 +329,7 @@ gc_time = Histogram(
)
-class GCCounts(object):
+class GCCounts:
def collect(self):
cm = GaugeMetricFamily("python_gc_counts", "GC object counts", labels=["gen"])
for n, m in enumerate(gc.get_count()):
@@ -347,7 +347,7 @@ if not running_on_pypy:
#
-class PyPyGCStats(object):
+class PyPyGCStats:
def collect(self):
# @stats is a pretty-printer object with __str__() returning a nice table,
@@ -482,7 +482,7 @@ build_info.labels(
last_ticked = time.time()
-class ReactorLastSeenMetric(object):
+class ReactorLastSeenMetric:
def collect(self):
cm = GaugeMetricFamily(
"python_twisted_reactor_last_seen",
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