modules/nixos/monitoring: switch to srvos alert rules
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zowoq
parent
45c02a685c
commit
e24a3ac8cb
3 changed files with 32 additions and 203 deletions
modules/nixos/monitoring
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@ -1,196 +1,32 @@
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{ lib }:
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lib.mapAttrsToList
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(name: opts: {
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alert = name;
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expr = opts.condition;
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for = opts.time or "2m";
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labels = { };
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annotations.description = opts.description;
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# for matrix alert-receiver
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annotations.summary = opts.description;
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})
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((lib.genAttrs [
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"borgbackup-job-github-org.service"
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"borgbackup-job-nixpkgs-update.service"
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]
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(name: {
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condition = ''absent_over_time(task_last_run{name="${name}"}[1d])'';
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description = "status of ${name} is unknown: no data for a day";
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})
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) // {
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prometheus_too_many_restarts = {
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condition = ''changes(process_start_time_seconds{job=~"prometheus|pushgateway|alertmanager|telegraf"}[15m]) > 2'';
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description = "Prometheus has restarted more than twice in the last 15 minutes. It might be crashlooping";
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};
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{ lib, ... }:
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{
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srvos.prometheus = {
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ruleGroups.srvosAlerts.alertRules =
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(lib.genAttrs [
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"borgbackup-job-github-org.service"
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"borgbackup-job-nixpkgs-update.service"
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]
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(name: {
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expr = ''absent_over_time(task_last_run{name="${name}"}[1d])'';
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annotations.description = "status of ${name} is unknown: no data for a day";
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})) //
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{
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Filesystem80percentFull.enable = false;
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alert_manager_config_not_synced = {
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condition = ''count(count_values("config_hash", alertmanager_config_hash)) > 1'';
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description = "Configurations of AlertManager cluster instances are out of sync";
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};
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Filesystem85percentFull = {
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expr = ''disk_used_percent{mode!="ro"} >= 85'';
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for = "10m";
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annotations.description = "{{$labels.host}} device {{$labels.device}} on {{$labels.path}} got less than 15% space left on its filesystem";
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};
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#alert_manager_e2e_dead_man_switch = {
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# condition = "vector(1)";
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# description = "Prometheus DeadManSwitch is an always-firing alert. It's used as an end-to-end test of Prometheus through the Alertmanager.";
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#};
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Load15.expr = lib.mkForce ''system_load15 / system_n_cpus{host!~"(build|darwin).*"} >= 2.0'';
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prometheus_not_connected_to_alertmanager = {
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condition = "prometheus_notifications_alertmanagers_discovered < 1";
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description = "Prometheus cannot connect the alertmanager\n VALUE = {{ $value }}\n LABELS = {{ $labels }}";
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};
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MatrixHookNotRunning = {
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expr = ''systemd_units_active_code{name="matrix-hook.service", sub!="running"}'';
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annotations.description = "{{$labels.host}} should have a running {{$labels.name}}";
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};
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prometheus_rule_evaluation_failures = {
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condition = "increase(prometheus_rule_evaluation_failures_total[3m]) > 0";
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description = "Prometheus encountered {{ $value }} rule evaluation failures, leading to potentially ignored alerts.\n VALUE = {{ $value }}\n LABELS = {{ $labels }}";
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};
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prometheus_template_expansion_failures = {
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condition = "increase(prometheus_template_text_expansion_failures_total[3m]) > 0";
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time = "0m";
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description = "Prometheus encountered {{ $value }} template text expansion failures\n VALUE = {{ $value }}\n LABELS = {{ $labels }}";
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};
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filesystem_full_85percent = {
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condition = ''disk_used_percent{mode!="ro"} >= 85'';
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time = "10m";
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description = "{{$labels.host}} device {{$labels.device}} on {{$labels.path}} got less than 15% space left on its filesystem";
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};
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filesystem_inodes_full = {
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condition = ''disk_inodes_free / disk_inodes_total < 0.10'';
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time = "10m";
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description = "{{$labels.host}} device {{$labels.device}} on {{$labels.path}} got less than 10% inodes left on its filesystem";
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};
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daily_task_not_run = {
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# give 6 hours grace period
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condition = ''time() - task_last_run{state="ok",frequency="daily"} > (24 + 6) * 60 * 60'';
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description = "{{$labels.host}}: {{$labels.name}} was not run in the last 24h";
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};
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daily_task_failed = {
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condition = ''task_last_run{state="fail"}'';
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description = "{{$labels.host}}: {{$labels.name}} failed to run";
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};
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nixpkgs_out_of_date = {
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condition = ''(time() - flake_input_last_modified{input="nixpkgs"}) / (60*60*24) > 7'';
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description = "{{$labels.host}}: nixpkgs flake is older than a week";
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};
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swap_using_30percent = {
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condition = ''mem_swap_total - (mem_swap_cached + mem_swap_free) > mem_swap_total * 0.3'';
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time = "30m";
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description = "{{$labels.host}} is using 30% of its swap space for at least 30 minutes";
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};
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# user@$uid.service and similar sometimes fail, we don't care about those services.
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systemd_service_failed = {
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condition = ''systemd_units_active_code{name!~"user@\\d+.service"} == 3'';
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description = "{{$labels.host}} failed to (re)start service {{$labels.name}}";
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};
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matrix_hook_not_running = {
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condition = ''systemd_units_active_code{name="matrix-hook.service", sub!="running"}'';
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description = "{{$labels.host}} should have a running {{$labels.name}}";
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};
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ram_using_95percent = {
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condition = "mem_buffered + mem_free + mem_cached < mem_total * 0.05";
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time = "1h";
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description = "{{$labels.host}} is using at least 95% of its RAM for at least 1 hour";
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};
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load15 = {
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condition = ''system_load15 / system_n_cpus{host!~"(build|darwin).*"} >= 2.0'';
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time = "10m";
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description = "{{$labels.host}} is running with load15 > 1 for at least 5 minutes: {{$value}}";
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};
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reboot = {
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condition = ''system_uptime < 300'';
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description = "{{$labels.host}} just rebooted";
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};
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uptime = {
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condition = ''system_uptime > (60*60*24*14)'';
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description = "Uptime monster: {{$labels.host}} has been up for more than 14 days";
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};
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telegraf_down = {
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condition = ''min(up{job=~"telegraf"}) by (job, instance, org) == 0'';
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time = "3m";
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description = "{{$labels.host}}: telegraf exporter is down";
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};
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http = {
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condition = "http_response_result_code != 0";
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description = "{{$labels.server}} : http request failed from {{$labels.host}}: {{$labels.result}}";
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};
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http_match_failed = {
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condition = "http_response_response_string_match == 0";
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description = "{{$labels.server}} : http body not as expected; status code: {{$labels.status_code}}";
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};
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connection_failed = {
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condition = "net_response_result_code != 0";
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description = "{{$labels.server}}: connection to {{$labels.port}}({{$labels.protocol}}) failed from {{$labels.host}}";
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};
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zfs_errors = {
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condition = "zfs_arcstats_l2_io_error + zfs_dmu_tx_error + zfs_arcstats_l2_writes_error > 0";
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description = "{{$labels.host}} reports: {{$value}} ZFS IO errors";
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};
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zpool_status = {
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condition = "zpool_status_errors > 0";
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description = "{{$labels.host}} reports: zpool {{$labels.name}} has {{$value}} errors";
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};
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mdraid_degraded_disks = {
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condition = "mdstat_degraded_disks > 0";
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description = "{{$labels.host}}: raid {{$labels.dev}} has failed disks";
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};
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# ignore devices that disabled S.M.A.R.T (example if attached via USB)
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# Also ignore build02, build03
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smart_errors = {
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condition = ''smart_device_health_ok{enabled!="Disabled", host!~"(build02|build03)"} != 1'';
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description = "{{$labels.host}}: S.M.A.R.T reports: {{$labels.device}} ({{$labels.model}}) has errors";
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};
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oom_kills = {
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condition = "increase(kernel_vmstat_oom_kill[5m]) > 0";
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description = "{{$labels.host}}: OOM kill detected";
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};
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unusual_disk_read_latency = {
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condition = "rate(diskio_read_time[1m]) / rate(diskio_reads[1m]) > 0.1 and rate(diskio_reads[1m]) > 0";
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description = "{{$labels.host}}: Disk latency is growing (read operations > 100ms)";
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};
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unusual_disk_write_latency = {
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condition = "rate(diskio_write_time[1m]) / rate(diskio_write[1m]) > 0.1 and rate(diskio_write[1m]) > 0";
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description = "{{$labels.host}}: Disk latency is growing (write operations > 100ms)";
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};
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ipv6_dad_check = {
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condition = "ipv6_dad_failures_count > 0";
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description = "{{$labels.host}}: {{$value}} assigned ipv6 addresses have failed duplicate address check";
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};
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host_memory_under_memory_pressure = {
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condition = "rate(node_vmstat_pgmajfault[1m]) > 1000";
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description = "{{$labels.host}}: The node is under heavy memory pressure. High rate of major page faults: {{$value}}";
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};
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ext4_errors = {
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condition = "ext4_errors_value > 0";
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description = "{{$labels.host}}: ext4 has reported {{$value}} I/O errors: check /sys/fs/ext4/*/errors_count";
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};
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alerts_silences_changed = {
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condition = ''abs(delta(alertmanager_silences{state="active"}[1h])) >= 1'';
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description = "alertmanager: number of active silences has changed: {{$value}}";
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};
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})
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SmartErrors.expr = lib.mkForce ''smart_device_health_ok{enabled!="Disabled", host!~"(build02|build03)"} != 1'';
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};
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};
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}
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@ -1,6 +1,8 @@
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{ config, ... }:
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{ config, inputs, ... }:
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{
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imports = [
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inputs.srvos.nixosModules.roles-prometheus
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./alert-rules.nix
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./grafana.nix
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./matrix-hook.nix
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./prometheus.nix
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@ -5,16 +5,7 @@
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services.prometheus = {
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enable = true;
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ruleFiles = [
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(pkgs.writeText "prometheus-rules.yml" (builtins.toJSON {
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groups = [
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{
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name = "alerting-rules";
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rules = import ./alert-rules.nix { inherit (pkgs) lib; };
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}
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];
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}))
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];
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checkConfig = true;
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webExternalUrl = "https://monitoring.nix-community.org/prometheus/";
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extraFlags = [ "--web.route-prefix=/" ];
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scrapeConfigs = [
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