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Export CacheMetric as hits+total, rather than hits+misses, as it's easier to derive hit ratio from that

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This commit is contained in:
Paul "LeoNerd" Evans 2015-03-09 20:35:33 +00:00
parent 1748605c5d
commit cbc0406be8
2 changed files with 9 additions and 8 deletions
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11
synapse/metrics/metric.py
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@ -134,7 +134,7 @@ class TimerMetric(CounterMetric):
class CacheMetric(object): class CacheMetric(object):
"""A combination of two CounterMetrics, one to count cache hits and one to """A combination of two CounterMetrics, one to count cache hits and one to
count misses, and a callback metric to yield the current size. count a total, and a callback metric to yield the current size.
This metric generates standard metric name pairs, so that monitoring rules This metric generates standard metric name pairs, so that monitoring rules
can easily be applied to measure hit ratio.""" can easily be applied to measure hit ratio."""
@ -142,8 +142,8 @@ class CacheMetric(object):
def __init__(self, name, size_callback, labels=[]): def __init__(self, name, size_callback, labels=[]):
self.name = name self.name = name
self.hits = CounterMetric(name + ":hits", labels=labels) self.hits = CounterMetric(name + ":hits", labels=labels)
self.misses = CounterMetric(name + ":misses", labels=labels) self.total = CounterMetric(name + ":total", labels=labels)
self.size = CallbackMetric(name + ":size", self.size = CallbackMetric(name + ":size",
callback=size_callback, callback=size_callback,
@ -152,9 +152,10 @@ class CacheMetric(object):
def inc_hits(self, *values): def inc_hits(self, *values):
self.hits.inc(*values) self.hits.inc(*values)
self.total.inc(*values)
def inc_misses(self, *values): def inc_misses(self, *values):
self.misses.inc(*values) self.total.inc(*values)
def render(self): def render(self):
return self.hits.render() + self.misses.render() + self.size.render() return self.hits.render() + self.total.render() + self.size.render()

6
tests/metrics/test_metric.py
View File

@ -140,7 +140,7 @@ class CacheMetricTestCase(unittest.TestCase):
self.assertEquals(metric.render(), [ self.assertEquals(metric.render(), [
'cache:hits 0', 'cache:hits 0',
'cache:misses 0', 'cache:total 0',
'cache:size 0', 'cache:size 0',
]) ])
@ -149,7 +149,7 @@ class CacheMetricTestCase(unittest.TestCase):
self.assertEquals(metric.render(), [ self.assertEquals(metric.render(), [
'cache:hits 0', 'cache:hits 0',
'cache:misses 1', 'cache:total 1',
'cache:size 1', 'cache:size 1',
]) ])
@ -157,6 +157,6 @@ class CacheMetricTestCase(unittest.TestCase):
self.assertEquals(metric.render(), [ self.assertEquals(metric.render(), [
'cache:hits 1', 'cache:hits 1',
'cache:misses 1', 'cache:total 2',
'cache:size 1', 'cache:size 1',
]) ])