277 lines
9.4 KiB
Nix
277 lines
9.4 KiB
Nix
# SPDX-FileCopyrightText: 2021-2024 Simon Bruder <simon@sbruder.de>
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#
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# SPDX-License-Identifier: AGPL-3.0-or-later
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{ config, lib, pkgs, ... }:
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let
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cfg = config.services.prometheus;
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mkStaticTargets = targets: lib.singleton { inherit targets; };
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mkStaticTarget = target: mkStaticTargets (lib.singleton target);
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in
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{
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services.prometheus = {
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enable = true;
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listenAddress = "127.0.0.1";
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webExternalUrl = "https://prometheus.sbruder.de";
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globalConfig = {
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scrape_interval = "15s";
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evaluation_interval = "15s";
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};
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extraFlags = [
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"--storage.tsdb.retention.time=90d"
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"--web.enable-admin-api"
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];
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alertmanagers = [
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{
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static_configs = mkStaticTarget "${cfg.alertmanager.listenAddress}:${toString cfg.alertmanager.port}";
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path_prefix = "/alertmanager/";
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}
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];
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alertmanager = {
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enable = true;
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listenAddress = "127.0.0.1";
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webExternalUrl = "https://prometheus.sbruder.de/alertmanager";
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configuration = {
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global.resolve_timeout = "2m";
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route = {
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receiver = "matrix";
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group_by = [ "alertname" ];
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group_wait = "3m";
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};
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receivers = [
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{
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name = "matrix";
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webhook_configs = lib.singleton {
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url = (lib.elemAt
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(lib.filter
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({ ID, ... }: ID == "alertmanager_service")
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config.services.go-neb.config.services)
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0).Config.webhook_url;
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};
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}
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];
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};
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};
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scrapeConfigs = [
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{
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job_name = "prometheus";
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static_configs = mkStaticTarget "localhost:${toString cfg.port}";
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}
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{
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job_name = "node";
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static_configs = mkStaticTargets [
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"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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"nazuna.vpn.sbruder.de:9100"
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"yuzuru.vpn.sbruder.de:9100"
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"koyomi.vpn.sbruder.de:9100"
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];
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relabel_configs = lib.singleton {
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target_label = "instance";
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source_labels = lib.singleton "__address__";
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regex = "(.*)\\.vpn\\.sbruder\\.de:9100";
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};
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}
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{
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job_name = "smartctl";
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static_configs = mkStaticTargets [
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"fuuko.vpn.sbruder.de:9633"
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"mayushii.vpn.sbruder.de:9633"
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"nunotaba.vpn.sbruder.de:9633"
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"hitagi.vpn.sbruder.de:9633"
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"shinobu.vpn.sbruder.de:9633"
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"koyomi.vpn.sbruder.de:9633"
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];
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relabel_configs = lib.singleton {
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target_label = "instance";
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source_labels = lib.singleton "__address__";
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regex = "(.*)\\.vpn\\.sbruder\\.de:9633";
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};
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}
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{
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job_name = "qbittorrent";
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static_configs = mkStaticTargets [
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"fuuko.vpn.sbruder.de:9561"
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"nazuna.vpn.sbruder.de:9561"
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];
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relabel_configs = lib.singleton {
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target_label = "instance";
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source_labels = lib.singleton "__address__";
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regex = "(.*)\\.vpn\\.sbruder\\.de:9561";
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};
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}
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(
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let
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listenerCfg = (lib.elemAt config.services.matrix-synapse.settings.listeners 0);
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in
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{
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job_name = "synapse";
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static_configs = mkStaticTarget "${lib.elemAt listenerCfg.bind_addresses 0}:${toString listenerCfg.port}";
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metrics_path = "/_synapse/metrics";
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relabel_configs = lib.singleton {
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target_label = "instance";
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replacement = "matrix.sbruder.de";
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};
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}
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)
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{
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job_name = "dnsmasq";
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static_configs = mkStaticTarget "shinobu.vpn.sbruder.de:${toString config.services.prometheus.exporters.dnsmasq.port}";
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relabel_configs = lib.singleton {
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target_label = "instance";
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replacement = "shinobu";
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};
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}
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{
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job_name = "hcloud";
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static_configs = mkStaticTarget config.services.hcloud_exporter.listenAddress;
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}
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{
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job_name = "co2";
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static_configs = mkStaticTarget "shinobu.vpn.sbruder.de:9672";
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}
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{
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job_name = "rspamd";
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static_configs = mkStaticTarget "vueko.vpn.sbruder.de";
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metrics_path = "/rspamd/metrics";
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relabel_configs = lib.singleton {
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target_label = "instance";
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replacement = "vueko.sbruder.de";
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};
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}
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{
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job_name = "knot";
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static_configs = mkStaticTargets [
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"vueko.vpn.sbruder.de:9433"
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"renge.vpn.sbruder.de:9433"
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"okarin.vpn.sbruder.de:9433"
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"yuzuru.vpn.sbruder.de:9433"
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];
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relabel_configs = lib.singleton {
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target_label = "instance";
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source_labels = lib.singleton "__address__";
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regex = "(.*)\\.vpn\\.sbruder\\.de:9433";
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};
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}
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{
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job_name = "snmp";
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metrics_path = "/snmp";
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params = {
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module = [ "if_mib" ];
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};
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static_configs = mkStaticTargets [
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"karibik.management.shinonome-lab.de"
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];
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relabel_configs = [
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{
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source_labels = lib.singleton "__address__";
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target_label = "__param_target";
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}
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{
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source_labels = lib.singleton "__param_target";
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target_label = "instance";
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}
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{
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target_label = "__address__";
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replacement = "shinobu.vpn.sbruder.de:9116";
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}
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];
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}
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];
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rules =
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let
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mkAlert = { name, expr, for ? "1m", description ? null }: {
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alert = name;
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inherit expr for;
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annotations = lib.optionalAttrs (description != null) { inherit description; };
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};
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in
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[
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(lib.generators.toYAML { } {
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groups = lib.singleton {
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name = "alert.rules";
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rules = map mkAlert [
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{
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name = "InstanceDown";
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expr = ''up{instance!~"(nunotaba|hitagi|mayushii|fuuko)"} == 0'';
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description = "Instance {{ $labels.instance }} of job {{ $labels.job }} has been down for more than 1 minutes.";
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}
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{
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name = "SystemdUnitFailed";
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expr = ''node_systemd_unit_state{state="failed"} == 1'';
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description = "Systemd unit {{ $labels.name }} on {{ $labels.instance }} has state failed.";
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}
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{
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name = "NodeHighLoad";
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expr = ''sum by (instance) (node_load15) / count by (instance) (node_cpu_seconds_total{mode="system"}) > 2'';
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for = "15m";
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description = "Node {{ $labels.instance }} is having a per-core load ≥ 2 for the last 15 minutes.";
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}
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{
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name = "NodeHighMemory";
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expr = ''(node_memory_MemTotal_bytes - node_memory_MemAvailable_bytes) / node_memory_MemTotal_bytes > 0.9'';
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for = "2m";
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description = "Node {{ $labels.instance }} is using more than 90 % of available RAM.";
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}
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{
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name = "TP440ACPIBroken";
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expr = ''node_hwmon_temp_celsius{chip="thermal_thermal_zone0",instance="nunotaba.vpn.sbruder.de:9100",job="node",sensor="temp1"} == 48'';
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for = "10m";
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description = "Thinkpad T440’s ACPI temperature is broken. Its reported temperature is 48 °C for the last 10 minutes. That doesn’t seem right. Try suspending";
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}
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{
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name = "TorrentNoPeers";
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expr = "sum by (instance) (qBittorrent_torrent_connected_leechs) == 0";
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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)
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{
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name = "DiskFull";
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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'';
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description = "Device {{ $labels.device }} on {{ $labels.instance }}:{{ $labels.mountpoint }} has less than 4GiB free space while being used over 40%";
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}
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];
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};
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})
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];
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};
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# exporters that are not part of nixpkgs’ prometheus infrastructure
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services.hcloud_exporter = {
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enable = true;
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listenAddress = "127.0.0.1:9501";
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environmentFile = config.sops.secrets.hcloud_exporter-environment.path;
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};
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sops.secrets.hcloud_exporter-environment.sopsFile = ../secrets.yaml;
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sops.secrets.prometheus-htpasswd = {
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owner = "nginx";
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sopsFile = ../secrets.yaml;
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};
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services.nginx.virtualHosts."prometheus.sbruder.de" = {
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enableACME = true;
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forceSSL = true;
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basicAuthFile = config.sops.secrets.prometheus-htpasswd.path;
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locations = {
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"/".proxyPass = "http://${cfg.listenAddress}:${toString cfg.port}";
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"/alertmanager/".proxyPass = "http://${cfg.alertmanager.listenAddress}:${toString cfg.alertmanager.port}";
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};
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};
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}
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