app-metrics/prometheus-cpu-mem-monitor: Add very first draft version

Package-Manager: Portage-2.3.76, Repoman-2.3.16

app-metrics/prometheus-cpu-mem-monitor/files/prometheus-cpu-mem-monitor.service

@@ -0,0 +1,11 @@
+# Calculate host statistics for prometheus
+# Written by Manuel Friedli
+# Changelog:
+# 2019-11-10: Inception
+
+[Unit]
+Description=Calculate CPU/Memory stats for prometheus
+
+[Service]
+Type=oneshot
+ExecStart=/usr/bin/prometheus-cpu-mem-monitor.sh

app-metrics/prometheus-cpu-mem-monitor/files/prometheus-cpu-mem-monitor.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+# Extract per-process CPU and memory usage from "ps aux" and send the data to prometheus
+#
+
+TARGET_URL="http://localhost:9091/metrics/job/top/instance/vps-02.friedli.info"
+
+z=$(ps aux)
+
+while read -r z
+do
+	cpustats=$cpustats$(awk '{print "cpu_usage{process=\""$11"\", pid=\""$2"\"}", $3z}');
+	memstats=$memstats$(awk '{print "memory_usage{process=\""$11"\", pid=\""$2"\"}", $4z}');
+done <<< "$z"
+
+curl -X POST -H "Content-Type: text/plain" --data "$cpustats
+" ${TARGET_URL}
+
+curl -X POST -H "Content-Type: text/plain" --data "$memstats
+" ${TARGET_URL}

app-metrics/prometheus-cpu-mem-monitor/files/prometheus-cpu-mem-monitor.timer

@@ -0,0 +1,15 @@
+# Timer for calculating host statistics for prometheus
+# Written by Manuel Friedli
+# Changelog:
+# 2019-11-10: Inception
+
+[Unit]
+Description=Timer for calculating CPU/Memory stats for prometheus
+
+[Timer]
+OnBootSec=1s
+OnUnitInactiveSec=10s
+AccuracySec=1s
+
+[Install]
+WantedBy=multi-user.target