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/uci-defaults/prometheus-defaults

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+[ -e /etc/config/prometheus ] || touch /etc/config/prometheus
+
+uci -q get prometheus.prometheus || {
+	uci -q batch <<EOF
+	set prometheus.prometheus=prometheus
+	set prometheus.prometheus.config_file='/etc/prometheus.yml'
+	set prometheus.prometheus.storage_tsdb_path='/data'
+	set prometheus.prometheus.web_listen_address='127.0.0.1:9090'
+	commit prometheus
+EOF
+}