nixos-config/machines/renge/services/prometheus.nix

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{ config, lib, pkgs, ... }:
let
cfg = config.services.prometheus;
mkStaticTargets = targets: lib.singleton { inherit targets; };
mkStaticTarget = target: mkStaticTargets (lib.singleton target);
in
{
services.prometheus = {
enable = true;
listenAddress = "127.0.0.1";
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webExternalUrl = "https://prometheus.sbruder.de";
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globalConfig = {
scrape_interval = "15s";
evaluation_interval = "15s";
};
extraFlags = [
"--storage.tsdb.retention.time=90d"
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"--web.enable-admin-api"
];
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alertmanagers = [
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{
static_configs = mkStaticTarget "${cfg.alertmanager.listenAddress}:${toString cfg.alertmanager.port}";
path_prefix = "/alertmanager/";
}
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];
alertmanager = {
enable = true;
listenAddress = "127.0.0.1";
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webExternalUrl = "https://prometheus.sbruder.de/alertmanager";
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configuration = {
global.resolve_timeout = "2m";
route = {
receiver = "matrix";
group_by = [ "alertname" ];
group_wait = "3m";
};
receivers = [
{
name = "matrix";
webhook_configs = lib.singleton {
url = (lib.elemAt
(lib.filter
({ ID, ... }: ID == "alertmanager_service")
config.services.go-neb.config.services)
0).Config.webhook_url;
};
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}
];
};
};
scrapeConfigs = [
{
job_name = "prometheus";
static_configs = mkStaticTarget "localhost:${toString cfg.port}";
}
{
job_name = "node";
static_configs = mkStaticTargets [
"fuuko.vpn.sbruder.de:9100"
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"mayushii.vpn.sbruder.de:9100"
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"nunotaba.vpn.sbruder.de:9100"
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"renge.vpn.sbruder.de:9100"
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"hitagi.vpn.sbruder.de:9100"
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"vueko.vpn.sbruder.de:9100"
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"okarin.vpn.sbruder.de:9100"
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"shinobu.vpn.sbruder.de:9100"
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];
}
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{
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job_name = "qbittorrent";
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static_configs = mkStaticTargets [
"fuuko.vpn.sbruder.de:9561"
];
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relabel_configs = lib.singleton {
target_label = "instance";
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source_labels = lib.singleton "__address__";
regex = "(.*)\\.vpn\\.sbruder\\.de:9561";
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};
}
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(
let
listenerCfg = (lib.elemAt config.services.matrix-synapse.settings.listeners 0);
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in
{
job_name = "synapse";
static_configs = mkStaticTarget "${lib.elemAt listenerCfg.bind_addresses 0}:${toString listenerCfg.port}";
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metrics_path = "/_synapse/metrics";
relabel_configs = lib.singleton {
target_label = "instance";
replacement = "matrix.sbruder.de";
};
}
)
{
job_name = "dnsmasq";
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static_configs = mkStaticTarget "shinobu.vpn.sbruder.de:${toString config.services.prometheus.exporters.dnsmasq.port}";
relabel_configs = lib.singleton {
target_label = "instance";
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replacement = "shinobu.home.sbruder.de";
};
}
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{
job_name = "hcloud";
static_configs = mkStaticTarget config.services.hcloud_exporter.listenAddress;
}
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{
job_name = "co2";
static_configs = mkStaticTarget "shinobu.vpn.sbruder.de:9672";
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}
{
job_name = "rspamd";
static_configs = mkStaticTarget "vueko.vpn.sbruder.de";
metrics_path = "/rspamd/metrics";
relabel_configs = lib.singleton {
target_label = "instance";
replacement = "vueko.sbruder.de";
};
}
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];
rules =
let
mkAlert = { name, expr, for ? "1m", description ? null }: {
alert = name;
inherit expr for;
annotations = lib.optionalAttrs (description != null) { inherit description; };
};
in
[
(lib.generators.toYAML { } {
groups = lib.singleton {
name = "alert.rules";
rules = map mkAlert [
{
name = "InstanceDown";
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expr = ''up{instance!~"(nunotaba|hitagi|mayushii|fuuko).vpn.sbruder.de:.*"} == 0'';
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description = "Instance {{ $labels.instance }} of job {{ $labels.job }} has been down for more than 1 minutes.";
}
{
name = "SystemdUnitFailed";
expr = ''node_systemd_unit_state{state="failed"} == 1'';
description = "Systemd unit {{ $labels.name }} on {{ $labels.instance }} has state failed.";
}
{
name = "NodeHighLoad";
expr = ''sum by (instance) (node_load15) / count by (instance) (node_cpu_seconds_total{mode="system"}) > 2'';
for = "15m";
description = "Node {{ $labels.instance }} is having a per-core load 2 for the last 15 minutes.";
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}
{
name = "NodeHighMemory";
expr = ''(node_memory_MemTotal_bytes - node_memory_MemAvailable_bytes) / node_memory_MemTotal_bytes > 0.9'';
for = "2m";
description = "Node {{ $labels.instance }} is using more than 90% of available RAM.";
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}
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{
name = "TP440ACPIBroken";
expr = ''node_hwmon_temp_celsius{chip="thermal_thermal_zone0",instance="nunotaba.vpn.sbruder.de:9100",job="node",sensor="temp1"} == 48'';
for = "10m";
description = "Thinkpad T440s ACPI temperature is broken. Its reported temperature is 48°C for the last 10 minutes. That doesnt seem right. Try suspending";
}
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{
name = "TorrentNoPeers";
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expr = "sum by (instance) (qBittorrent_torrent_connected_leechs) == 0";
description = "qBittorrent instance {{ $labels.instance }} has no peers. There might be a network connectivity problem";
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}
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# <40% is to account for /boot being full (which causes ugly errors on rebuild)
{
name = "DiskFull";
expr = ''node_filesystem_free_bytes{fstype!~"ramfs|tmpfs", mountpoint!~"/nix/store"} / node_filesystem_size_bytes{fstype!~"ramfs|tmpfs", mountpoint!~"/nix/store"} < 0.4 and node_filesystem_free_bytes{fstype!~"ramfs|tmpfs", mountpoint!~"/nix/store"} < 4*1024^3'';
description = "Device {{ $labels.device }} on {{ $labels.instance }}:{{ $labels.mountpoint }} has less than 4GiB free space while being used over 40%";
}
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];
};
})
];
};
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# exporters that are not part of nixpkgs prometheus infrastructure
services.hcloud_exporter = {
enable = true;
listenAddress = "127.0.0.1:9501";
environmentFile = config.sops.secrets.hcloud_exporter-environment.path;
};
sops.secrets.hcloud_exporter-environment.sopsFile = ../secrets.yaml;
sops.secrets.prometheus-htpasswd = {
owner = "nginx";
sopsFile = ../secrets.yaml;
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};
services.nginx.virtualHosts."prometheus.sbruder.de" = {
enableACME = true;
forceSSL = true;
basicAuthFile = config.sops.secrets.prometheus-htpasswd.path;
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locations = {
"/".proxyPass = "http://${cfg.listenAddress}:${toString cfg.port}";
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"/alertmanager/".proxyPass = "http://${cfg.alertmanager.listenAddress}:${toString cfg.alertmanager.port}";
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};
};
}