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report metrics on number of cache evictions

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This commit is contained in:
Richard van der Hoff 2018-02-01 17:57:51 +00:00
parent 77c0629ebc
commit bc496df192
5 changed files with 56 additions and 5 deletions
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11
synapse/metrics/metric.py
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@ -193,7 +193,9 @@ class DistributionMetric(object):
class CacheMetric(object):
__slots__ = ("name", "cache_name", "hits", "misses", "size_callback")
__slots__ = (
"name", "cache_name", "hits", "misses", "evicted_size", "size_callback",
)
def __init__(self, name, size_callback, cache_name):
self.name = name
@ -201,6 +203,7 @@ class CacheMetric(object):
self.hits = 0
self.misses = 0
self.evicted_size = 0
self.size_callback = size_callback
@ -210,6 +213,9 @@ class CacheMetric(object):
def inc_misses(self):
self.misses += 1
def inc_evictions(self, size=1):
self.evicted_size += size
def render(self):
size = self.size_callback()
hits = self.hits
@ -219,6 +225,9 @@ class CacheMetric(object):
"""%s:hits{name="%s"} %d""" % (self.name, self.cache_name, hits),
"""%s:total{name="%s"} %d""" % (self.name, self.cache_name, total),
"""%s:size{name="%s"} %d""" % (self.name, self.cache_name, size),
"""%s:evicted_size{name="%s"} %d""" % (
self.name, self.cache_name, self.evicted_size
),
]