From f418cf8620070d429f9b2e74a196dc913d68cd83 Mon Sep 17 00:00:00 2001 From: xinyangli Date: Tue, 30 Jul 2024 15:56:02 +0800 Subject: [PATCH] feat: better prometheus integration --- modules/nixos/prometheus.nix | 274 +++++++++++++++++++++++++++-------- 1 file changed, 212 insertions(+), 62 deletions(-) diff --git a/modules/nixos/prometheus.nix b/modules/nixos/prometheus.nix index 9ddd255..b4a02cc 100644 --- a/modules/nixos/prometheus.nix +++ b/modules/nixos/prometheus.nix @@ -25,71 +25,221 @@ in }; }; - config = mkIf cfg.enable (mkMerge [{ - services.caddy.globalConfig = '' - servers { - metrics - } - ''; - services.restic.server.prometheus = cfg.enable; - services.gotosocial.settings = { - metrics-enable = true; - }; - services.prometheus = mkIf cfg.enable { - enable = true; - port = 9091; - globalConfig.external_labels = { hostname = config.networking.hostName; }; - remoteWrite = mkIf cfg.grafana.enable [ - { name = "grafana"; - url = "https://prometheus-prod-24-prod-eu-west-2.grafana.net/api/prom/push"; - basic_auth = { - username = "1340065"; - password_file = cfg.grafana.password_file; - }; - } - ]; - exporters = { - node = { - enable = true; - enabledCollectors = [ "systemd" ]; - port = 9100; - }; + config = mkIf cfg.enable (mkMerge [ + { + services.tailscale = { + enable = true; + permitCertUid = config.services.caddy.user; }; - scrapeConfigs = [ - { job_name = "prometheus"; - static_configs = [ - { targets = [ "localhost:${toString config.services.prometheus.port}" ]; } - ]; + + services.caddy = { + enable = true; + virtualHosts."${config.networking.hostName}.coho-tet.ts.net".extraConfig = '' + reverse_proxy 127.0.0.1:${toString config.services.prometheus.port} + ''; + }; + + services.caddy.globalConfig = '' + servers { + metrics } - { job_name = "node"; - static_configs = [ - { targets = [ "localhost:${toString config.services.prometheus.exporters.node.port}" ]; } + ''; + services.restic.server.prometheus = cfg.enable; + services.gotosocial.settings = mkIf cfg.enable { + metrics-enabled = true; + }; + services.ntfy-sh.settings.enable-metrics = true; + + services.prometheus = mkIf cfg.enable + { + enable = true; + port = 9091; + globalConfig.external_labels = { hostname = config.networking.hostName; }; + remoteWrite = mkIf cfg.grafana.enable [ + { + name = "grafana"; + url = "https://prometheus-prod-24-prod-eu-west-2.grafana.net/api/prom/push"; + basic_auth = { + username = "1340065"; + password_file = cfg.grafana.password_file; + }; + } ]; - } + exporters = { + node = { + enable = true; + enabledCollectors = [ + "conntrack" + "diskstats" + "entropy" + "filefd" + "filesystem" + "loadavg" + "meminfo" + "netdev" + "netstat" + "stat" + "time" + "vmstat" + "systemd" + "logind" + "interrupts" + "ksmd" + ]; + port = 9100; + }; + }; + scrapeConfigs = [ + { + job_name = "prometheus"; + static_configs = [ + { targets = [ "localhost:${toString config.services.prometheus.port}" ]; } + ]; + } + { + job_name = "node"; + static_configs = [ + { targets = [ "localhost:${toString config.services.prometheus.exporters.node.port}" ]; } + ]; + } + ]; + + alertmanager = { + enable = true; + listenAddress = "127.0.0.1"; + logLevel = "debug"; + configuration = { + route = { + receiver = "ntfy"; + }; + receivers = [ + { + name = "ntfy"; + webhook_configs = [ + { + url = "https://ntfy.xinyang.life/prometheus-alerts?tpl=yes&m=${lib.escapeURL '' + Alert {{.status}} + {{range .alerts}}-----{{range $k,$v := .labels}} + {{$k}}={{$v}}{{end}} + {{end}} + ''}"; + send_resolved = true; + } + ]; + } + ]; + }; + }; + + alertmanagers = [ + { + scheme = "http"; + static_configs = [ + { + targets = [ + "${config.services.prometheus.alertmanager.listenAddress}:${toString config.services.prometheus.alertmanager.port}" + ]; + } + ]; + } + ]; + + rules = let mkRule = condition: { ... }@rule: (if condition then [ rule ] else [ ]); in [ + (lib.generators.toYAML { } { + groups = (mkRule true + { + name = "system_alerts"; + rules = [ + { + alert = "SystemdFailedUnits"; + expr = "node_systemd_unit_state{state=\"failed\"} > 0"; + for = "5m"; + labels = { severity = "critical"; }; + annotations = { summary = "Systemd has failed units on {{ $labels.instance }}"; description = "There are {{ $value }} failed units on {{ $labels.instance }}. Immediate attention required!"; }; + } + { + alert = "HighLoadAverage"; + expr = "node_load1 > 0.8 * count without (cpu) (node_cpu_seconds_total{mode=\"idle\"})"; + for = "1m"; + labels = { severity = "warning"; }; + annotations = { summary = "High load average detected on {{ $labels.instance }}"; description = "The 1-minute load average ({{ $value }}) exceeds 80% the number of CPUs."; }; + } + { + alert = "HighTransmitTraffic"; + expr = "rate(node_network_transmit_bytes_total{device!=\"lo\"}[5m]) > 100000000"; + for = "1m"; + labels = { severity = "warning"; }; + annotations = { summary = "High network transmit traffic on {{ $labels.instance }} ({{ $labels.device }})"; description = "The network interface {{ $labels.device }} on {{ $labels.instance }} is transmitting data at a rate exceeding 100 MB/s for the last 1 minute."; }; + } + ]; + }) ++ (mkRule config.services.restic.server.enable { + name = "restic_alerts"; + rules = [ + { + alert = "ResticCheckFailed"; + expr = "restic_check_success == 0"; + for = "5m"; + labels = { severity = "critical"; }; + annotations = { summary = "Restic check failed (instance {{ $labels.instance }})"; description = "Restic check failed\\n VALUE = {{ $value }}\\n LABELS = {{ $labels }}"; }; + } + { + alert = "ResticOutdatedBackup"; + expr = "time() - restic_backup_timestamp > 518400"; + for = "0m"; + labels = { severity = "critical"; }; + annotations = { summary = "Restic {{ $labels.client_hostname }} / {{ $labels.client_username }} backup is outdated"; description = "Restic backup is outdated\\n VALUE = {{ $value }}\\n LABELS = {{ $labels }}"; }; + } + ]; + }) ++ (mkRule config.services.caddy.enable { + name = "caddy_alerts"; + rules = [ + { + alert = "UpstreamHealthy"; + expr = "caddy_reverse_proxy_upstreams_healthy == 0"; + for = "5m"; + labels = { severity = "critical"; }; + annotations = { summary = "Upstream {{ $labels.unstream }} not healthy"; }; + } + { + alert = "HighRequestLatency"; + expr = "histogram_quantile(0.95, rate(caddy_http_request_duration_seconds_bucket[10m])) > 0.5"; + for = "2m"; + labels = { severity = "warning"; }; + annotations = { summary = "High request latency on {{ $labels.instance }}"; description = "95th percentile of request latency is above 0.5 seconds for the last 2 minutes."; }; + } + ]; + }); + }) + ]; + }; + } + { + services.prometheus.scrapeConfigs = [ + (mkIf config.services.caddy.enable { + job_name = "caddy"; + static_configs = [ + { targets = [ "localhost:2019" ]; } + ]; + }) + (mkIf config.services.restic.server.enable { + job_name = "restic"; + static_configs = [ + { targets = [ config.services.restic.server.listenAddress ]; } + ]; + }) + (mkIf config.services.gotosocial.enable { + job_name = "gotosocial"; + static_configs = [ + { targets = [ "localhost:${toString config.services.gotosocial.settings.port}" ]; } + ]; + }) + (mkIf config.services.ntfy-sh.enable { + job_name = "ntfy-sh"; + static_configs = [ + { targets = [ "auth.xinyang.life" ]; } + ]; + }) ]; - }; - } - { - services.prometheus.scrapeConfigs = [ - ( mkIf config.services.caddy.enable { - job_name = "caddy"; - static_configs = [ - { targets = [ "localhost:2019" ]; } - ]; - }) - ( mkIf config.services.restic.server.enable { - job_name = "restic"; - static_configs = [ - { targets = [ config.services.restic.server.listenAddress ]; } - ]; - }) - ( mkIf config.services.gotosocial.enable { - job_name = "gotosocial"; - static_configs = [ - { targets = [ "localhost:${toString config.services.gotosocial.settings.port}" ]; } - ]; - }) - ]; - } + } ]); }