filebeat/input/{tcp,udp}: fix the base of the queue length parsers

This was incorrectly claimed to be decimal due to misreading the kernel source.

CHANGELOG.next.asciidoc

@@ -74,6 +74,7 @@ https://github.com/elastic/beats/compare/v8.8.1\...main[Check the HEAD diff]
 - Fix handling of Juniper SRX structured data when there is no leading junos element. {issue}36270[36270] {pull}36308[36308]
 - Fix Filebeat Cisco module with missing escape character {issue}36325[36325] {pull}36326[36326]
 - Added a fix for Crowdstrike pipeline handling process arrays {pull}36496[36496]
+- Fix TCP/UDP metric queue length parsing base. {pull}37714[37714]
 
 *Heartbeat*
 

filebeat/input/tcp/input.go

@@ -342,10 +342,10 @@ func procNetTCP(path string, addr []string, hasUnspecified bool, addrIsUnspecifi
 			}
 			found = true
 
-			// queue lengths are decimal, e.g.:
+			// queue lengths are hex, e.g.:
 			// - https://elixir.bootlin.com/linux/v6.2.11/source/net/ipv4/tcp_ipv4.c#L2643
 			// - https://elixir.bootlin.com/linux/v6.2.11/source/net/ipv6/tcp_ipv6.c#L1987
-			v, err := strconv.ParseInt(string(r), 10, 64)
+			v, err := strconv.ParseInt(string(r), 16, 64)
 			if err != nil {
 				return 0, fmt.Errorf("failed to parse rx_queue: %w", err)
 			}

filebeat/input/udp/input.go

@@ -340,10 +340,10 @@ func procNetUDP(path string, addr []string, hasUnspecified bool, addrIsUnspecifi
 			}
 			found = true
 
-			// queue lengths and drops are decimal, e.g.:
+			// queue lengths and drops are hex, e.g.:
 			// - https://elixir.bootlin.com/linux/v6.2.11/source/net/ipv4/udp.c#L3110
 			// - https://elixir.bootlin.com/linux/v6.2.11/source/net/ipv6/datagram.c#L1048
-			v, err := strconv.ParseInt(string(r), 10, 64)
+			v, err := strconv.ParseInt(string(r), 16, 64)
 			if err != nil {
 				return 0, 0, fmt.Errorf("failed to parse rx_queue: %w", err)
 			}