remove leaking timeout, fix blocking upstreams checks, leaking is per listener, OS resolvers are tested in parallel, reset is only done is os is down

fix test

use upstreamIS var

init map, fix watcher flag

attempt to detect network changes

attempt to detect network changes

cancel and rerun reinitializeOSResolver

cancel and rerun reinitializeOSResolver

cancel and rerun reinitializeOSResolver

ignore invalid inferaces

ignore invalid inferaces

allow OS resolver upstream to fail

dont wait for dnsWait group on reinit, check for active interfaces to trigger reinit

fix unused var

simpler active iface check, debug logs

dont spam network service name patching on Mac

dont wait for os resolver nameserver testing

remove test for osresovlers for now

async nameserver testing

remove unused test

cmd/cli/upstream_monitor.go

@@ -44,10 +44,6 @@ func newUpstreamMonitor(cfg *ctrld.Config) *upstreamMonitor {
 
 // increaseFailureCount increase failed queries count for an upstream by 1.
 func (um *upstreamMonitor) increaseFailureCount(upstream string) {
-	// Do not count "upstream.os", since it must not be down for leaking queries.
-	if upstream == upstreamOS {
-		return
-	}
 	um.mu.Lock()
 	defer um.mu.Unlock()