解决postun事务内容为空的问题

Signed-off-by: herengui <herengui@uniontech.com>

alertmanager.spec

@@ -2,7 +2,7 @@
 
 Name:    alertmanager
 Version: 0.21.0
-Release: 2%{?dist}
+Release: 3
 Summary: Prometheus Alertmanager.
 License: ASL 2.0
 URL:     https://github.com/prometheus/%{name}
@@ -56,7 +56,7 @@ exit 0
 %systemd_preun %{name}.service
 
 %postun
-%systemd_postun %{name}.service
+%systemd_postun_with_restart %{name}.service
 
 %files
 %defattr(-,root,root,-)
@@ -68,5 +68,10 @@ exit 0
 %dir %attr(755, prometheus, prometheus)%{_sharedstatedir}/prometheus
 
 %changelog
+* Thu Aug 05 2021 herengui <herengui@uniontech.com> - 0.21.0-3
+- Type: bugfix
+- ID: #I4431I
+- DESC: solve empty postun transaction issue.
+
 * Tue Aug 11 2020 houjian <houjian@kylinos.cn> - 0.21.0-2
 - Package init