Backport of fix(peering): increase the gRPC limit to 8MB into release/1.14.x (#15589)

* backport of commit 84b287cc3c

Co-authored-by: cskh <hui.kang@hashicorp.com>

.changelog/15503.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+peering: fix the limit of replication gRPC message; set to 8MB
+```

agent/consul/leader_peering.go

@@ -360,7 +360,7 @@ func (s *Server) establishStream(ctx context.Context,
 				// send keepalive pings even if there is no active streams
 				PermitWithoutStream: true,
 			}),
-			grpc.WithDefaultCallOptions(grpc.MaxCallSendMsgSize(50 * 1024 * 1024)),
+			grpc.WithDefaultCallOptions(grpc.MaxCallSendMsgSize(8*1024*1024), grpc.MaxCallRecvMsgSize(8*1024*1024)),
 		}
 
 		logger.Trace("dialing peer", "addr", addr)

agent/grpc-internal/client.go

@@ -148,7 +148,9 @@ func (c *ClientConnPool) dial(datacenter string, serverType string) (*grpc.Clien
 		grpc.WithKeepaliveParams(keepalive.ClientParameters{
 			Time:    30 * time.Second,
 			Timeout: 10 * time.Second,
-		}))
+		}),
+		grpc.WithDefaultCallOptions(grpc.MaxCallSendMsgSize(8*1024*1024), grpc.MaxCallRecvMsgSize(8*1024*1024)),
+	)
 	if err != nil {
 		return nil, err
 	}

website/content/docs/connect/cluster-peering/index.mdx

@@ -46,7 +46,7 @@ Regardless of whether you connect your clusters through WAN federation or cluste
 
 Consider the following technical constraints:
 
-- Services with node, instance, and check definitions totaling more than 50MB cannot be exported to a peer.
+- Services with node, instance, and check definitions totaling more than 8MB cannot be exported to a peer.
 - Two admin partitions in the same datacenter cannot be peered. Use [`exported-services`](/docs/connect/config-entries/exported-services#exporting-services-to-peered-clusters) directly.
 - The `consul intention` CLI command is not supported. To manage intentions that specify services in peered clusters, use [configuration entries](/docs/connect/config-entries/service-intentions).
 - Accessing key/value stores across peers is not supported.