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

app-admin/loki/files/loki.confd

@@ -0,0 +1,5 @@
+# The loki config file
+LOKI_CONF="/etc/loki/loki-local-config.yaml"
+
+# Add any extra options to pass to loki to this setting.
+#LOKI_OPTS=""

app-admin/loki/files/loki.initd

@@ -0,0 +1,11 @@
+#!/sbin/openrc-run
+
+configfile="${LOKI_CONF:-/etc/loki/loki-local-config.yaml}"
+
+command=/usr/bin/loki
+command_args="-config.file=${configfile}
+	${LOKI_OPTS}"
+command_background=yes
+command_user=loki:grafana
+make_pidfile=yes
+pidfile=/var/run/loki.pid

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