prometheus: add package

Compile tested: x86/64, aarch64_cortex-a53
Run tested: x86/64

Signed-off-by: Paul Spooren <spooren@informatik.uni-leipzig.de>
Signed-off-by: Paul Spooren <mail@aparcar.org>

utils/prometheus/files/etc/init.d/prometheus

@@ -0,0 +1,27 @@
+#!/bin/sh /etc/rc.common
+
+START=70
+
+USE_PROCD=1
+PROG=/usr/bin/prometheus
+CONFFILE=/etc/prometheus.yml
+
+start_service() {
+	local config_file
+	local storage_tsdb_path
+	local web_listen_address
+	config_load "prometheus"
+	config_get config_file prometheus config_file "$CONFFILE"
+	config_get storage_tsdb_path prometheus storage_tsdb_path "/data"
+	config_get web_listen_address prometheus web_listen_address "127.0.0.1:9090"
+
+	procd_open_instance
+	procd_set_param command "$PROG"
+	procd_append_param command --config.file="$config_file"
+	procd_append_param command --storage.tsdb.path="$storage_tsdb_path"
+	procd_append_param command --web.listen-address="$web_listen_address"
+	procd_append_param user "prometheus"
+	procd_set_param file "$config_file"
+	procd_set_param respawn
+	procd_close_instance
+}