{ pkgs, lib, config, ... }: # from https://gist.github.com/globin/02496fd10a96a36f092a8e7ea0e6c7dd { networking = { firewall.allowedTCPPorts = [ 9090 # prometheus 9093 # alertmanager ]; }; services = { nginx.virtualHosts = { "prometheus.shack" = { locations."/".proxyPass = "http://localhost:9090"; }; "alert.prometheus.shack" = { locations."/".proxyPass = "http://localhost:9093"; }; }; prometheus = { enable = true; extraFlags = [ "-storage.local.retention 8760h" "-storage.local.series-file-shrink-ratio 0.3" "-storage.local.memory-chunks 2097152" "-storage.local.max-chunks-to-persist 1048576" "-storage.local.index-cache-size.fingerprint-to-metric 2097152" "-storage.local.index-cache-size.fingerprint-to-timerange 1048576" "-storage.local.index-cache-size.label-name-to-label-values 2097152" "-storage.local.index-cache-size.label-pair-to-fingerprints 41943040" ]; alertmanagerURL = [ "http://localhost:9093" ]; rules = [ '' ALERT node_down IF up == 0 FOR 5m LABELS { severity="page" } ANNOTATIONS { summary = "{{$labels.alias}}: Node is down.", description = "{{$labels.alias}} has been down for more than 5 minutes." } ALERT node_systemd_service_failed IF node_systemd_unit_state{state="failed"} == 1 FOR 4m LABELS { severity="page" } ANNOTATIONS { summary = "{{$labels.alias}}: Service {{$labels.name}} failed to start.", description = "{{$labels.alias}} failed to (re)start service {{$labels.name}}." } ALERT node_filesystem_full_90percent IF sort(node_filesystem_free{device!="ramfs"} < node_filesystem_size{device!="ramfs"} * 0.1) / 1024^3 FOR 5m LABELS { severity="page" } ANNOTATIONS { summary = "{{$labels.alias}}: Filesystem is running out of space soon.", description = "{{$labels.alias}} device {{$labels.device}} on {{$labels.mountpoint}} got less than 10% space left on its filesystem." } ALERT node_filesystem_full_in_4h IF predict_linear(node_filesystem_free{device!="ramfs"}[1h], 4*3600) <= 0 FOR 5m LABELS { severity="page" } ANNOTATIONS { summary = "{{$labels.alias}}: Filesystem is running out of space in 4 hours.", description = "{{$labels.alias}} device {{$labels.device}} on {{$labels.mountpoint}} is running out of space of in approx. 4 hours" } ALERT node_filedescriptors_full_in_3h IF predict_linear(node_filefd_allocated[1h], 3*3600) >= node_filefd_maximum FOR 20m LABELS { severity="page" } ANNOTATIONS { summary = "{{$labels.alias}} is running out of available file descriptors in 3 hours.", description = "{{$labels.alias}} is running out of available file descriptors in approx. 3 hours" } ALERT node_load1_90percent IF node_load1 / on(alias) count(node_cpu{mode="system"}) by (alias) >= 0.9 FOR 1h LABELS { severity="page" } ANNOTATIONS { summary = "{{$labels.alias}}: Running on high load.", description = "{{$labels.alias}} is running with > 90% total load for at least 1h." } ALERT node_cpu_util_90percent IF 100 - (avg by (alias) (irate(node_cpu{mode="idle"}[5m])) * 100) >= 90 FOR 1h LABELS { severity="page" } ANNOTATIONS { summary = "{{$labels.alias}}: High CPU utilization.", description = "{{$labels.alias}} has total CPU utilization over 90% for at least 1h." } ALERT node_ram_using_90percent IF node_memory_MemFree + node_memory_Buffers + node_memory_Cached < node_memory_MemTotal * 0.1 FOR 30m LABELS { severity="page" } ANNOTATIONS { summary="{{$labels.alias}}: Using lots of RAM.", description="{{$labels.alias}} is using at least 90% of its RAM for at least 30 minutes now.", } '' ]; scrapeConfigs = [ { job_name = "node"; scrape_interval = "10s"; static_configs = [ { targets = [ "localhost:9100" ]; labels = { alias = "wolf.shack"; }; } { targets = [ "localhost:9130" ]; labels = { alias = "unifi.shack"; }; } { targets = [ "10.42.22.184:9100" # puyak.shack ]; labels = { alias = "puyak.shack"; }; } { targets = [ "phenylbutazon.shack:9100" ]; labels = { alias = "phenylbutazon.shack"; }; } { targets = [ "ibuprofen.shack:9100" ]; labels = { alias = "ibuprofen.shack"; }; } ]; } ]; alertmanager = { enable = true; listenAddress = "0.0.0.0"; configuration = { "global" = { "smtp_smarthost" = "smtp.example.com:587"; "smtp_from" = "alertmanager@example.com"; }; "route" = { "group_by" = [ "alertname" "alias" ]; "group_wait" = "30s"; "group_interval" = "2m"; "repeat_interval" = "4h"; "receiver" = "team-admins"; }; "receivers" = [ { "name" = "team-admins"; "email_configs" = [ { "to" = "devnull@example.com"; "send_resolved" = true; } ]; "webhook_configs" = [ { "url" = "https://example.com/prometheus-alerts"; "send_resolved" = true; } ]; } ]; }; }; }; }; }