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Update cache metrics (#4781)

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Add a total cache request counter to follow Prometheus conventions[0].
Mark the existing cache miss metric as deprecated.

> Similarly, with hit or miss for caches, it’s better to have one
> metric for total and another for hits.

[0]: https://prometheus.io/docs/instrumenting/writing_exporters/#naming

Signed-off-by: SuperQ <superq@gmail.com>
This commit is contained in:
Ben Kochie 2021-08-16 07:54:36 +02:00 • committed by GitHub
parent 88d94dc148
commit 7d542fec67
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3 changed files with 13 additions and 3 deletions
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2
plugin/cache/handler.go vendored
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@ -91,6 +91,7 @@ func (c *Cache) Name() string { return "cache" }
func (c *Cache) get(now time.Time, state request.Request, server string) (*item, bool) {
k := hash(state.Name(), state.QType())
cacheRequests.WithLabelValues(server).Inc()
if i, ok := c.ncache.Get(k); ok && i.(*item).ttl(now) > 0 {
cacheHits.WithLabelValues(server, Denial).Inc()
@ -108,6 +109,7 @@ func (c *Cache) get(now time.Time, state request.Request, server string) (*item,
// getIgnoreTTL unconditionally returns an item if it exists in the cache.
func (c *Cache) getIgnoreTTL(now time.Time, state request.Request, server string) *item {
k := hash(state.Name(), state.QType())
cacheRequests.WithLabelValues(server).Inc()
if i, ok := c.ncache.Get(k); ok {
ttl := i.(*item).ttl(now)