Linux audit (auditd) source and LogStream internal logs

Audit source (source_type=audit), off until enabled in Settings > Sources:
- follows /var/log/audit/audit.log (path configurable, AUDIT_LOG), with
  rotation (end of audit.log.1 read first) and an offset checkpoint in
  /data/audit-state.json; last AUDIT_BACKFILL (1h) read on first enable
- groups the records of an event by msg=audit(time:serial), closed on EOE,
  after 2 s without a record, or once the log has moved 2 s past it
- fields audit_type, audit_serial, auid, user (enriched name, host
  /etc/passwd or uid), exe, res, key, audit_raw; app = audit_type, host =
  node= / AUDIT_HOST / /host/etc/hostname; summary "who: what [key] →
  result"; warning when res=failed / success=no, info otherwise
- hexadecimal values (proctitle, cmd, exec arguments…) decoded

Internal logs (source_type=logstream, host=logstream, app=component):
- logEvent() for VictoriaLogs unreachable / back, lost batches, spooled
  batches refused, syslog listener errors, Docker API and container
  streams lost, failing sources, start and stop
- on by default from warning; switch and minimum level in Settings >
  Sources (/data/selflog.json)
- bounded queue, never waits for the Store, same event at most once per
  30 s with a count of the repeats: a failing Store cannot loop

UI: violet (audit) and turquoise (LogStream) left edge and tint, AUDIT /
LS badge before the app, raw audit record under the summary (folded in
compact density until the row is opened), Audit and LogStream in the
source filter, FR/EN translations. docker-compose: optional
/var/log/audit, /etc/passwd and /etc/hostname mounts. README (EN/FR):
host prerequisites (log_group, ACL for UID 10001).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

syslog.go

@@ -36,7 +36,7 @@ type Entry struct {
 	Proto    string // udp or tcp
 	HostIP   string // original host value when it was an IP resolved through DNS
 
-	SourceType string            // "syslog", "docker", "host" or "kernel"
+	SourceType string            // "syslog", "docker", "host", "kernel", "audit" or "logstream"
 	Extra      map[string]string // additional fields (docker: container, image, …)
 
 	// Not stored. Wait: the producer can be slowed down when the queue is full
@@ -239,7 +239,7 @@ func serveUDP(ctx context.Context, pc net.PacketConn, sink func(*Entry)) {
 			if ctx.Err() != nil {
 				return
 			}
-			log.Printf("syslog udp: %v", err)
+			logEvent("syslog", 4, "UDP read error: %v", err)
 			time.Sleep(100 * time.Millisecond)
 			continue
 		}
@@ -262,14 +262,14 @@ func serveTCP(ctx context.Context, ln net.Listener, sink func(*Entry)) {
 			if ctx.Err() != nil {
 				return
 			}
-			log.Printf("syslog tcp: %v", err)
+			logEvent("syslog", 4, "TCP accept error: %v", err)
 			time.Sleep(100 * time.Millisecond)
 			continue
 		}
 		select {
 		case slots <- struct{}{}:
 		default:
-			log.Printf("syslog tcp: %d connections already open, refusing %s", tcpMaxConns, conn.RemoteAddr())
+			logEvent("syslog", 4, "%d TCP connections already open, refusing %s", tcpMaxConns, conn.RemoteAddr())
 			conn.Close()
 			continue
 		}