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net/dns/resolver: add metrics to PTR lookup misses

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Updates tailscale/corp#3326

Change-Id: I58077d889a3b58ef0633267c92ffb265686ce152
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2021-12-19 09:48:30 -08:00 committed by David Crawshaw
parent 39f22a357d
commit 0848b36dd2
1 changed files with 5 additions and 0 deletions
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5
net/dns/resolver/tsdns.go
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@ -1087,11 +1087,13 @@ func rdnsNameToIPv6(name dnsname.FQDN) (ip netaddr.IP, ok bool) {
// It is assumed that resp.Question is populated by respond before this is called.
func (r *Resolver) respondReverse(query []byte, name dnsname.FQDN, resp *response) ([]byte, error) {
if hasRDNSBonjourPrefix(name) {
metricDNSReverseMissBonjour.Add(1)
return nil, errNotOurName
}
resp.Name, resp.Header.RCode = r.resolveLocalReverse(name)
if resp.Header.RCode == dns.RCodeRefused {
metricDNSReverseMissOther.Add(1)
return nil, errNotOurName
}
@ -1235,4 +1237,7 @@ func unARPA(a string) (ipStr string, ok bool) {
metricDNSResolveLocalNoAll = clientmetric.NewCounter("dns_resolve_local_no_all")
metricDNSResolveNotImplType = clientmetric.NewCounter("dns_resolve_local_not_impl_type")
metricDNSResolveNoRecordType = clientmetric.NewCounter("dns_resolve_local_no_record_type")
metricDNSReverseMissBonjour = clientmetric.NewCounter("dns_reverse_miss_bonjour")
metricDNSReverseMissOther = clientmetric.NewCounter("dns_reverse_miss_other")
)