Fix detection of HAProxy Enterprise

With recent versions of HAProxy Enterprise (HAPEE) the socket is no more
created in a hapee subdirectory.

Change-Id: I6bc645aeb3255ba7a92155065ad6a477dcb843b2
Jira: SUP-29063
Co-authored-by: Solomon Jacobs <solomon.jacobs@checkmk.com>
Closes: #915

Author: mayrstefan

.werks/19706.md

@@ -0,0 +1,15 @@
+[//]: # (werk v3)
+# haproxy: Support for new socket path
+
+key        | value
+---------- | ---
+date       | 2026-05-19T09:16:56.680212+00:00
+version    | 2.6.0b1
+class      | fix
+edition    | community
+component  | checks
+level      | 1
+compatible | yes
+
+Recent versions of HAProxy Enterprise moved the stats socket from a versioned subdirectory (`/var/run/hapee-<version>/hapee-lb.sock`) to directly under `/var/run/hapee-lb.sock`, which the agent failed to detect.
+This Werk adds the new path to the agent's socket search list.

agents/check_mk_agent.linux

@@ -1460,7 +1460,7 @@ section_proxmox() {
 
 section_haproxy() {
     # Consider sockets for community v2.x and v3.x AND enterprise edition
-    for HAPROXY_SOCK in /run/haproxy/admin.sock /var/lib/haproxy/stats /var/run/haproxy.sock /var/run/hapee-*/hapee-lb.sock; do
+    for HAPROXY_SOCK in /run/haproxy/admin.sock /var/lib/haproxy/stats /var/run/haproxy.sock /var/run{,/hapee-*}/hapee-lb.sock; do
         if [ -r "${HAPROXY_SOCK}" ] && inpath socat; then
             echo "<<<haproxy:sep(44)>>>"
             echo "show stat" | socat - "UNIX-CONNECT:${HAPROXY_SOCK}"