Berwn
d8d4a686eb
iperf3 serves throughput tests from every VLAN and the mesh; an hourly librespeed run feeds speedtest_* metrics through node_exporter's textfile collector, and vmalert flags download rates below half the link's own 7-day median so ISP degradation surfaces without per-site thresholds.
68 lines
2.0 KiB
Nix
68 lines
2.0 KiB
Nix
# Periodic WAN speed test so ISP degradation shows up as a trend instead of a
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# complaint. A timer runs librespeed-cli and writes the results as Prometheus
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# metrics into node_exporter's textfile collector — they ride the existing
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# 9100 scrape to VictoriaMetrics, where alerts.nix compares each run against
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# the link's own 7-day median (no per-site threshold to maintain).
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{
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config,
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lib,
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pkgs,
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...
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}:
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let
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cfg = config.cnx.router;
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textfileDir = "/var/lib/speedtest";
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in
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{
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options.cnx.router.speedtest.interval = lib.mkOption {
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type = lib.types.str;
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default = "hourly";
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description = "systemd OnCalendar spec for the WAN speed test.";
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};
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config = lib.mkIf cfg.enable {
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services.prometheus.exporters.node.extraFlags = [
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"--collector.textfile.directory=${textfileDir}"
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];
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systemd.services.speedtest = {
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description = "WAN speed test to Prometheus textfile metrics";
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after = [ "network-online.target" ];
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wants = [ "network-online.target" ];
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path = [
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pkgs.librespeed-cli
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pkgs.jq
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];
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serviceConfig = {
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Type = "oneshot";
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StateDirectory = "speedtest";
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# One test at boot would race PPPoE and log a spurious failure.
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ExecCondition = "${pkgs.iproute2}/bin/ip link show ppp0";
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};
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script = ''
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tmp="${textfileDir}/.speedtest.prom.tmp"
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if result=$(librespeed-cli --json); then
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jq -r '.[0]
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| "speedtest_download_mbps \(.download)",
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"speedtest_upload_mbps \(.upload)",
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"speedtest_ping_ms \(.ping)",
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"speedtest_jitter_ms \(.jitter)",
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"speedtest_success 1"' <<<"$result" > "$tmp"
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else
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echo "speedtest_success 0" > "$tmp"
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fi
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mv "$tmp" "${textfileDir}/speedtest.prom"
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'';
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};
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systemd.timers.speedtest = {
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wantedBy = [ "timers.target" ];
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timerConfig = {
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OnCalendar = cfg.speedtest.interval;
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RandomizedDelaySec = "10m";
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Persistent = true;
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};
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};
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};
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}
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