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net/dns/resolver: add metric for number of truncated dns packets

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Updates #2067

This should help us determine if more robust control of edns parameters
+ implementing answer truncation is warranted, given its likely complexity.

Signed-off-by: Tom DNetto <tom@tailscale.com>
This commit is contained in:
Tom DNetto
2022-04-22 15:01:55 -07:00
committed by Tom
parent 80ba161c40
commit 5fb8e01a8b
2 changed files with 28 additions and 2 deletions
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net/dns/resolver/tsdns.go
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@@ -1340,6 +1340,7 @@ var (
metricDNSFwdErrorType = clientmetric.NewCounter("dns_query_fwd_error_type")
metricDNSFwdErrorParseAddr = clientmetric.NewCounter("dns_query_fwd_error_parse_addr")
metricDNSFwdTruncated = clientmetric.NewCounter("dns_query_fwd_truncated")
metricDNSFwdUDP = clientmetric.NewCounter("dns_query_fwd_udp") // on entry
metricDNSFwdUDPWrote = clientmetric.NewCounter("dns_query_fwd_udp_wrote") // sent UDP packet