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>

selflog_test.go

@@ -0,0 +1,102 @@
+package main
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestSelfLogEmit(t *testing.T) {
+	now := time.Unix(1759572000, 0)
+	tests := []struct {
+		name   string
+		cfg    selfLogConfig
+		events []int // severities, one second apart, same message format
+		want   int   // entries queued
+		suffix string
+	}{
+		{"warning and above", selfLogConfig{Enabled: true, MinLevel: "warning"}, []int{3}, 1, ""},
+		{"below the level", selfLogConfig{Enabled: true, MinLevel: "warning"}, []int{5, 6}, 0, ""},
+		{"info level", selfLogConfig{Enabled: true, MinLevel: "info"}, []int{6}, 1, ""},
+		{"disabled", selfLogConfig{Enabled: false, MinLevel: "debug"}, []int{0}, 0, ""},
+		{"bad level falls back to warning", normSelfLogConfig(selfLogConfig{Enabled: true, MinLevel: "loud"}), []int{4, 5}, 1, ""},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			s := NewSelfLog(t.TempDir(), func(*Entry) {})
+			s.cfg = tt.cfg
+			for i, sev := range tt.events {
+				s.Emit("store", sev, "fmt %d", "msg", now.Add(time.Duration(i)*time.Second))
+			}
+			if len(s.queue) != tt.want {
+				t.Fatalf("%d queued, want %d", len(s.queue), tt.want)
+			}
+		})
+	}
+
+	// Same component and format: once per interval, then a count of the others.
+	s := NewSelfLog(t.TempDir(), func(*Entry) {})
+	for i := 0; i < 5; i++ {
+		s.Emit("store", 3, "%d messages lost", "x", now.Add(time.Duration(i)*time.Second))
+	}
+	s.Emit("syslog", 3, "%d messages lost", "y", now) // another component
+	s.Emit("store", 3, "%d messages lost", "z", now.Add(s.interval))
+	if len(s.queue) != 3 {
+		t.Fatalf("%d queued", len(s.queue))
+	}
+	<-s.queue
+	if e := <-s.queue; e.App != "syslog" || e.Host != "logstream" || e.SourceType != "logstream" || e.Wait {
+		t.Fatalf("entry %+v", e)
+	}
+	if e := <-s.queue; e.Message != "z (4 similar events not shown)" || e.Severity != "err" {
+		t.Fatalf("message %q", e.Message)
+	}
+	if st := s.Status(); st["throttled"] != uint64(4) {
+		t.Fatalf("status %v", st)
+	}
+
+	// A full queue drops events instead of blocking.
+	s = NewSelfLog(t.TempDir(), func(*Entry) {})
+	for i := 0; i < cap(s.queue)+10; i++ {
+		s.Emit("store", 3, "event %d", "x", now.Add(time.Duration(i)*s.interval))
+	}
+	if st := s.Status(); st["dropped"] != uint64(10) {
+		t.Fatalf("status %v", st)
+	}
+}
+
+func TestSelfLogRunAndConfigure(t *testing.T) {
+	dir := t.TempDir()
+	sink := &entrySink{}
+	s := NewSelfLog(dir, sink.add)
+	if err := s.Configure(selfLogConfig{Enabled: true, MinLevel: "notice"}); err != nil {
+		t.Fatal(err)
+	}
+	if b, _ := os.ReadFile(filepath.Join(dir, "selflog.json")); !strings.Contains(string(b), `"notice"`) {
+		t.Fatalf("saved %s", b)
+	}
+	if s2 := NewSelfLog(dir, nil); s2.cfg.MinLevel != "notice" {
+		t.Fatalf("reloaded %+v", s2.cfg)
+	}
+	old := selfLog
+	selfLog = s
+	defer func() { selfLog = old }()
+
+	ctx, cancel := context.WithCancel(context.Background())
+	done := make(chan struct{})
+	go func() { s.Run(ctx); close(done) }()
+	logEvent("main", 5, "LogStream started")
+	logEvent("main", 6, "too verbose")
+	cancel()
+	<-done
+	logEvent("main", 5, "LogStream stopping") // queued after Run: not lost if Run drains it
+	sink.mu.Lock()
+	n := len(sink.es)
+	sink.mu.Unlock()
+	if n != 1 || s.Status()["emitted"] != uint64(1) {
+		t.Fatalf("%d entries, status %v", n, s.Status())
+	}
+}