[app-admin/loki] interim version, not really tested.

app-admin/loki/files/loki.service

@@ -0,0 +1,17 @@
+[Unit]
+Description=Loki
+Wants=network-online.target
+After=network-online.target
+
+[Service]
+User=loki
+Group=grafana
+Type=simple
+Restart=on-failure
+EnvironmentFile=/etc/conf.d/loki
+Environment=LOKI_CONF=/etc/loki/loki-local-config.yaml
+ExecStart=/usr/bin/loki -config.file=${LOKI_CONF} ${LOKI_OPTS}
+PIDFile=/run/loki.pid
+
+[Install]
+WantedBy=multi-user.target