prometheus-statsd-exporter: add new package

statsd_exporter receives StatsD-style metrics and exports them as Prometheus
metrics.

Signed-off-by: Andre Heider <a.heider@gmail.com>

utils/prometheus-statsd-exporter/files/etc/config/prometheus-statsd-exporter

@@ -0,0 +1,6 @@
+config prometheus-statsd-exporter 'main'
+	option web_listen_address '127.0.0.1:9102'
+	option web_telemetry_path '/metrics'
+	option statsd_listen_udp '127.0.0.1:9125'
+	option statsd_listen_tcp '127.0.0.1:9125'
+	option statsd_mapping_config '/etc/prometheus-statsd-exporter.yml'

utils/prometheus-statsd-exporter/files/etc/init.d/prometheus-statsd-exporter

@@ -0,0 +1,35 @@
+#!/bin/sh /etc/rc.common
+
+START=60
+
+USE_PROCD=1
+PROG=/usr/bin/statsd_exporter
+CONFFILE=/etc/prometheus-statsd-exporter.yml
+
+start_service() {
+	local web_listen_address
+	local web_telemetry_path
+	local statsd_listen_udp
+	local statsd_listen_tcp
+	local statsd_mapping_config
+	config_load "prometheus-statsd-exporter"
+	config_get web_listen_address main web_listen_address "127.0.0.1:9102"
+	config_get web_telemetry_path main web_telemetry_path "/metrics"
+	config_get statsd_listen_udp main statsd_listen_udp "127.0.0.1:9125"
+	config_get statsd_listen_tcp main statsd_listen_tcp "127.0.0.1:9125"
+	config_get statsd_mapping_config main statsd_mapping_config "$CONFFILE"
+
+	procd_open_instance
+	procd_set_param command "$PROG"
+	procd_append_param command --web.listen-address="$web_listen_address"
+	procd_append_param command --web.telemetry-path="$web_telemetry_path"
+	procd_append_param command --statsd.listen-udp="$statsd_listen_udp"
+	procd_append_param command --statsd.listen-tcp="$statsd_listen_tcp"
+	procd_append_param command --statsd.mapping-config="$statsd_mapping_config"
+	procd_append_param command --log.level="warn"
+	procd_set_param file "$config_file"
+	procd_set_param stdout 1
+	procd_set_param stderr 1
+	procd_set_param respawn
+	procd_close_instance
+}

utils/prometheus-statsd-exporter/files/etc/prometheus-statsd-exporter.yml

@@ -0,0 +1,24 @@
+mappings:
+  # asterisk mappings
+  # use "prefix = asterisk" in asterisk's statsd.conf
+  - match: asterisk.PJSIP.registrations.state.*
+    name: "asterisk_PJSIP_registrations_state"
+    labels:
+      state: "$1"
+  - match: asterisk.PJSIP.endpoints.state.*
+    name: "asterisk_PJSIP_endpoints_state"
+    labels:
+      state: "$1"
+  - match: asterisk.PJSIP.contacts.states.*
+    name: "asterisk_PJSIP_contacts_states"
+    labels:
+      state: "$1"
+  - match: asterisk.endpoints.state.*
+    name: "asterisk_endpoints_state"
+    labels:
+      state: "$1"
+  - match: asterisk.endpoints.*.*.channels
+    name: "asterisk_endpoints_channels"
+    labels:
+      tech: "$1"
+      resource: "$2"