Switch to use Miekg by default (#4519)

* Switch to use Miekg by default

Signed-off-by: clyang82 <[email protected]>

* Update changelog.md

Signed-off-by: clyang82 <[email protected]>

* Address review comments

Signed-off-by: clyang82 <[email protected]>

Author: clyang82

CHANGELOG.md

@@ -22,6 +22,7 @@ We use *breaking :warning:* to mark changes that are not backward compatible (re
 - [#4476](https://github.com/thanos-io/thanos/pull/4476) UI: fix incorrect html escape sequence used for '>' symbol.
 
 ### Changed
+- [#4519](https://github.com/thanos-io/thanos/pull/4519) Query: switch to miekgdns DNS resolver as the default one.
 
 ## [v0.22.0](https://github.com/thanos-io/thanos/tree/release-0.22) - 2021.07.22
 

cmd/thanos/query.go

@@ -127,7 +127,7 @@ func registerQuery(app *extkingpin.App) {
 		Default("30s"))
 
 	dnsSDResolver := cmd.Flag("store.sd-dns-resolver", fmt.Sprintf("Resolver to use. Possible options: [%s, %s]", dns.GolangResolverType, dns.MiekgdnsResolverType)).
-		Default(string(dns.GolangResolverType)).Hidden().String()
+		Default(string(dns.MiekgdnsResolverType)).Hidden().String()
 
 	unhealthyStoreTimeout := extkingpin.ModelDuration(cmd.Flag("store.unhealthy-timeout", "Timeout before an unhealthy store is cleaned from the store UI page.").Default("5m"))
 

pkg/cacheutil/memcached_client.go

@@ -247,7 +247,7 @@ func newMemcachedClient(
 		addressProvider = dns.NewProvider(
 			logger,
 			extprom.WrapRegistererWithPrefix("thanos_memcached_", reg),
-			dns.GolangResolverType,
+			dns.MiekgdnsResolverType,
 		)
 	}