feat(dashboard): show HAProxy check_status code on DOWN servers

When a backend server is DOWN, the HAProxy card now shows the check_status
code (L4CON, L4TOUT, L7STS, L6CON, …) as a volcano-colored tag next to
the DOWN badge. Hovering shows a plain-English explanation of the failure
reason so operators can diagnose without leaving the dashboard. v1.1.116.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

VERSION

@@ -1 +1 @@
-1.1.115
+1.1.116

cmd/edgeguard-api/main.go

@@ -60,7 +60,7 @@ import (
 	usersvc "git.netcell-it.de/projekte/edgeguard-native/internal/services/users"
 )
 
-var version = "1.1.115"
+var version = "1.1.116"
 
 func main() {
 	addr := os.Getenv("EDGEGUARD_API_ADDR")

cmd/edgeguard-ctl/main.go

@@ -11,7 +11,7 @@ import (
 	"git.netcell-it.de/projekte/edgeguard-native/internal/services/setup"
 )
 
-var version = "1.1.115"
+var version = "1.1.116"
 
 const usage = `edgeguard-ctl — EdgeGuard CLI
 

cmd/edgeguard-scheduler/main.go

@@ -41,7 +41,7 @@ import (
 	"git.netcell-it.de/projekte/edgeguard-native/internal/services/tlscerts"
 )
 
-var version = "1.1.115"
+var version = "1.1.116"
 
 const (
 	// renewTickInterval — how often we re-evaluate expiring certs.

management-ui/src/pages/Dashboard/index.tsx

@@ -145,6 +145,22 @@ function relativeTime(unix: number, t: (k: string, v?: Record<string, unknown>)
   if (sec < 86400) return t('common.relTime.Xh', { n: Math.floor(sec / 3600) })
   return t('common.relTime.Xd', { n: Math.floor(sec / 86400) })
 }
+function haCheckHint(code: string): string {
+  const hints: Record<string, string> = {
+    L4CON:   'TCP connection refused — server port closed or firewall blocking',
+    L4TOUT:  'TCP connection timeout — server unreachable (routing/firewall/server down)',
+    L6CON:   'SSL/TLS handshake failed — certificate or ALPN mismatch',
+    L6TOUT:  'SSL/TLS timeout',
+    L6RSP:   'SSL/TLS protocol error',
+    L7STS:   'HTTP check: unexpected status code (health-check path returns non-2xx)',
+    L7RSP:   'HTTP check: unexpected response from server',
+    L7TOUT:  'HTTP check: timeout waiting for response',
+    SOCKERR: 'Socket error — OS-level problem (EAGAIN, ECONNRESET …)',
+    INI:     'Check not yet performed since last reload',
+  }
+  return hints[code] ?? code
+}
+
 function formatUptime(sec: number): string {
   if (sec < 60)   return `${sec}s`
   const days = Math.floor(sec / 86400)
@@ -515,6 +531,11 @@ export default function DashboardPage() {
                         color={b.status === 'UP' ? 'green' : b.status === 'no check' ? 'default' : 'red'}
                         style={{ margin: 0, fontSize: 10 }}
                       >{b.status}</Tag>
+                      {b.health && b.health !== 'L7OK' && b.health !== 'L4OK' && (
+                        <Tooltip title={haCheckHint(b.health)}>
+                          <Tag color="volcano" style={{ margin: 0, fontSize: 10, cursor: 'help' }}>{b.health}</Tag>
+                        </Tooltip>
+                      )}
                       <Text type="secondary" style={{ fontSize: 11 }}>
                         {b.sessions} sess{b.req_rate > 0 ? ` · ${b.req_rate}/s` : ''} · ↓{formatBytes(b.bytes_in)} ↑{formatBytes(b.bytes_out)}
                       </Text>