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
+}

utils/prometheus/files/etc/prometheus.yml

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+# my global config
+global:
+  scrape_interval:     15s # Set the scrape interval to every 15 seconds. Default is every 1 minute.
+  evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute.
+  # scrape_timeout is set to the global default (10s).
+
+# Alertmanager configuration
+alerting:
+  alertmanagers:
+  - static_configs:
+    - targets:
+      # - alertmanager:9093
+
+# Load rules once and periodically evaluate them according to the global 'evaluation_interval'.
+rule_files:
+  # - "first_rules.yml"
+  # - "second_rules.yml"
+
+# A scrape configuration containing exactly one endpoint to scrape:
+# Here it's Prometheus itself.
+scrape_configs:
+  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
+  - job_name: 'prometheus'
+
+    # metrics_path defaults to '/metrics'
+    # scheme defaults to 'http'.
+
+    static_configs:
+    - targets: ['localhost:9090']

utils/prometheus/files/etc/uci-defaults/prometheus-defaults

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+#!/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
+}

utils/prometheus/files/prometheus.yml

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+# my global config
+global:
+  scrape_interval:     15s # Set the scrape interval to every 15 seconds. Default is every 1 minute.
+  evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute.
+  # scrape_timeout is set to the global default (10s).
+
+# Alertmanager configuration
+alerting:
+  alertmanagers:
+  - static_configs:
+    - targets:
+      # - alertmanager:9093
+
+# Load rules once and periodically evaluate them according to the global 'evaluation_interval'.
+rule_files:
+  # - "first_rules.yml"
+  # - "second_rules.yml"
+
+# A scrape configuration containing exactly one endpoint to scrape:
+# Here it's Prometheus itself.
+scrape_configs:
+  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
+  - job_name: 'prometheus'
+
+    # metrics_path defaults to '/metrics'
+    # scheme defaults to 'http'.
+
+    static_configs:
+    - targets: ['localhost:9090']