feat: add audit logs for dormancy events (#15298)

coderd/audit/fields.go

@@ -0,0 +1,33 @@
+package audit
+
+import (
+	"context"
+	"encoding/json"
+
+	"cdr.dev/slog"
+)
+
+type BackgroundSubsystem string
+
+const (
+	BackgroundSubsystemDormancy BackgroundSubsystem = "dormancy"
+)
+
+func BackgroundTaskFields(subsystem BackgroundSubsystem) map[string]string {
+	return map[string]string{
+		"automatic_actor":     "coder",
+		"automatic_subsystem": string(subsystem),
+	}
+}
+
+func BackgroundTaskFieldsBytes(ctx context.Context, logger slog.Logger, subsystem BackgroundSubsystem) []byte {
+	af := BackgroundTaskFields(subsystem)
+
+	wriBytes, err := json.Marshal(af)
+	if err != nil {
+		logger.Error(ctx, "marshal additional fields for dormancy audit", slog.Error(err))
+		return []byte("{}")
+	}
+
+	return wriBytes
+}