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Add cache eviction metrics to the cache plugin (#4411)

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Signed-off-by: Frank Riley <fhriley@gmail.com>
This commit is contained in:
Frank Riley
2021-03-21 08:58:16 -07:00
committed by GitHub
parent ed3f287fe8
commit 5b9b079dab
4 changed files with 22 additions and 5 deletions
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8
plugin/cache/cache.go vendored
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@@ -190,7 +190,9 @@ func (w *ResponseWriter) set(m *dns.Msg, key uint64, mt response.Type, duration
switch mt {
case response.NoError, response.Delegation:
i := newItem(m, w.now(), duration)
w.pcache.Add(key, i)
if w.pcache.Add(key, i) {
evictions.WithLabelValues(w.server, Success).Inc()
}
// when pre-fetching, remove the negative cache entry if it exists
if w.prefetch {
w.ncache.Remove(key)
@@ -198,7 +200,9 @@ func (w *ResponseWriter) set(m *dns.Msg, key uint64, mt response.Type, duration
case response.NameError, response.NoData, response.ServerError:
i := newItem(m, w.now(), duration)
w.ncache.Add(key, i)
if w.ncache.Add(key, i) {
evictions.WithLabelValues(w.server, Denial).Inc()
}
case response.OtherError:
// don't cache these