Fix typos in Promtail systemd unit

roles/promtail/templates/promtail.service.j2

@@ -1,19 +1,19 @@
 {{ ansible_managed | comment }}
 
 [Unit]
-Description=Loki
-After=network-online.target
+Description=Promtail service
+After=network.target
 
 [Service]
 Type=simple
 User={{ promtail_user }}
-Group={{ promtail_group }}
 ExecStart={{ promtail_bin_path }}/promtail \
-  -config.file {{ promtail_config_path }}
+  -config.file {{ promtail_config_path }} \
+  -client.external-labels=host=%l
 WorkingDirectory={{ promtail_var_path }}
-
-Restart=always
-RestartSec=1
+TimeoutSec = 60
+Restart=on-failure
+RestartSec=2
 
 [Install]
 WantedBy=multi-user.target