node/grpc: Return to passthrough address resolution scheme (#3334)

Author: roman-khimov

CHANGELOG.md

@@ -34,6 +34,7 @@ Changelog for NeoFS Node
 - Race between basic income processing stages leading to distribution failures in some cases (#3338)
 - Wallet password logged by IR in some error cases (#3340)
 - Embedded CN not stopped properly in some error cases potentially leading to inconsistent blockchain DB state (#3340)
+- SN gRPC dialer switched from problematic `dns` address resolver to the `passthrough` one (#3334)
 
 ### Changed
 - IR calls `ObjectService.SearchV2` to select SG objects now (#3144)

cmd/neofs-node/grpc.go

@@ -14,9 +14,13 @@ import (
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials"
 	"google.golang.org/grpc/keepalive"
+	"google.golang.org/grpc/resolver"
 )
 
 func initGRPC(c *cfg) {
+	// although docs state that 'passthrough' is set by default, it should be set explicitly for activation
+	resolver.SetDefaultScheme("passthrough")
+
 	if c.cfgMorph.client == nil {
 		initMorphComponents(c)
 	}