Stop sub-classing object (#8249)

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",