From fc836fc0cb2aa2a9e65b2314ab361788d8e73186 Mon Sep 17 00:00:00 2001
From: makefu <github@syntax-fehler.de>
Date: Mon, 14 Sep 2020 11:11:58 +0200
Subject: shack/prometheus: strip down number of alerts to 3

---
 krebs/2configs/shack/prometheus/alert-rules.nix | 135 +++++++-----------------
 krebs/2configs/shack/prometheus/server.nix      |   9 +-
 2 files changed, 43 insertions(+), 101 deletions(-)

(limited to 'krebs/2configs/shack')

diff --git a/krebs/2configs/shack/prometheus/alert-rules.nix b/krebs/2configs/shack/prometheus/alert-rules.nix
index afef5b8a..730921be 100644
--- a/krebs/2configs/shack/prometheus/alert-rules.nix
+++ b/krebs/2configs/shack/prometheus/alert-rules.nix
@@ -1,97 +1,42 @@
-{ lib }:
-with lib;
-
+{ lib,... }:
 let
-  deviceFilter = ''device!="ramfs",device!="rpc_pipefs",device!="lxcfs",device!="nsfs",device!="borgfs"'';
-in mapAttrsToList (name: opts: {
-  alert = name;
-  expr = opts.condition;
-  for = opts.time or "2m";
-  labels = if (opts.page or true) then { severity = "page"; } else {};
-  annotations = {
-    summary = opts.summary;
-    description = opts.description;
-  };
-}) {
-  node_down = {
-    condition = ''up{job="node"} == 0'';
-    summary = "{{$labels.alias}}: Node is down.";
-    description = "{{$labels.alias}} has been down for more than 2 minutes.";
-  };
-  node_systemd_service_failed = {
-    condition = ''node_systemd_unit_state{state="failed"} == 1'';
-    summary = "{{$labels.alias}}: Service {{$labels.name}} failed to start.";
-    description = "{{$labels.alias}} failed to (re)start service {{$labels.name}}.";
-  };
-  node_filesystem_full_80percent = {
-    condition = ''sort(node_filesystem_free_bytes{${deviceFilter}} < node_filesystem_size_bytes{${deviceFilter}} * 0.2) / 1024^3'';
-    time = "10m";
-    summary = "{{$labels.alias}}: Filesystem is running out of space soon.";
-    description = "{{$labels.alias}} device {{$labels.device}} on {{$labels.mountpoint}} got less than 20% space left on its filesystem.";
-  };
-  node_filesystem_full_in_7d = {
-    condition = ''predict_linear(node_filesystem_free_bytes{${deviceFilter}}[2d], 7*24*3600) <= 0'';
-    time = "1h";
-    summary = "{{$labels.alias}}: Filesystem is running out of space in 7 days.";
-    description = "{{$labels.alias}} device {{$labels.device}} on {{$labels.mountpoint}} is running out of space of in approx. 7 days";
-  };
-  node_filesystem_full_in_30d = {
-    condition = ''predict_linear(node_filesystem_free_bytes{${deviceFilter}}[30d], 30*24*3600) <= 0'';
-    time = "1h";
-    summary = "{{$labels.alias}}: Filesystem is running out of space in 30 days.";
-    description = "{{$labels.alias}} device {{$labels.device}} on {{$labels.mountpoint}} is running out of space of in approx. 30 days";
-  };
-  node_filedescriptors_full_in_3h = {
-    condition = ''predict_linear(node_filefd_allocated[3h], 3*3600) >= node_filefd_maximum'';
-    time = "20m";
-    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";
-  };
-  node_filedescriptors_full_in_7d = {
-    condition = ''predict_linear(node_filefd_allocated[7d], 7*24*3600) >= node_filefd_maximum'';
-    time = "1h";
-    summary = "{{$labels.alias}} is running out of available file descriptors in 7 days.";
-    description = "{{$labels.alias}} is running out of available file descriptors in approx. 7 days";
-  };
-  node_load15 = {
-    condition = ''node_load15 / on(alias) count(node_cpu_seconds_total{mode="system"}) by (alias) >= 1.0'';
-    time = "10m";
-    summary = "{{$labels.alias}}: Running on high load: {{$value}}";
-    description = "{{$labels.alias}} is running with load15 > 1 for at least 5 minutes: {{$value}}";
-  };
-  node_ram_using_90percent = {
-    condition =  "node_memory_MemFree_bytes + node_memory_Buffers_bytes + node_memory_Cached_bytes < node_memory_MemTotal_bytes * 0.1";
-    time = "1h";
-    summary = "{{$labels.alias}}: Using lots of RAM.";
-    description = "{{$labels.alias}} is using at least 90% of its RAM for at least 1 hour.";
-  };
-  node_swap_using_30percent = {
-    condition = "node_memory_SwapTotal_bytes - (node_memory_SwapFree_bytes + node_memory_SwapCached_bytes) > node_memory_SwapTotal_bytes * 0.3";
-    time = "30m";
-    summary = "{{$labels.alias}}: Using more than 30% of its swap.";
-    description = "{{$labels.alias}} is using 30% of its swap space for at least 30 minutes.";
-  };
-  node_hwmon_temp = {
-    condition = "node_hwmon_temp_celsius > node_hwmon_temp_crit_celsius*0.9 OR node_hwmon_temp_celsius > node_hwmon_temp_max_celsius*0.95";
-    time = "5m";
-    summary = "{{$labels.alias}}: Sensor {{$labels.sensor}}/{{$labels.chip}} temp is high: {{$value}} ";
-    description = "{{$labels.alias}} reports hwmon sensor {{$labels.sensor}}/{{$labels.chip}} temperature value is nearly critical: {{$value}}";
-  };
-  node_conntrack_limit = {
-    condition  = "node_nf_conntrack_entries_limit - node_nf_conntrack_entries < 1000";
-    time = "5m";
-    summary = "{{$labels.alias}}: Number of tracked connections high";
-    description = "{{$labels.alias}} has only {{$value}} free slots for connection tracking available.";
-  };
-  node_reboot = {
-    condition = "time() - node_boot_time_seconds < 300";
-    summary = "{{$labels.alias}}: Reboot";
-    description = "{{$labels.alias}} just rebooted.";
-  };
-  node_uptime = {
-    condition = "time() - node_boot_time_seconds > 2592000";
-    page = false;
-    summary = "{{$labels.alias}}: Uptime monster";
-    description = "{{$labels.alias}} has been up for more than 30 days.";
-  };
+  disk_free_threshold = "10"; # at least this much free disk percentage
+in {
+  services.prometheus.rules = [(builtins.toJSON
+    {
+      groups = [
+        { name = "shack-env";
+          rules = [
+            {
+              alert = "RootPartitionFull";
+              for = "30m";
+              expr = ''(node_filesystem_avail_bytes{alias="wolf",mountpoint="/"} * 100) / node_filesystem_size_bytes{alias="wolf",mountpoint="/"} < ${disk_free_threshold}'';
+              labels.severity = "warning";
+              annotations.summary = "{{ $labels.alias }} root disk full";
+              annotations.url = "http://grafana.shack/";
+              annotations.description = ''The root disk of {{ $labels.alias }} has {{ $value | printf "%.2f" }}% free disk space (Threshold at ${disk_free_threshold}%).A vast number of shackspace services will stop working. CI for deploying new configuration will also seize working. Log in to the system and run `nix-collect-garbage -d` and clean up the shack share folder in `/home/share` .If this does not help you can check `du -hs /var/ | sort -h`, run `docker system prune` or if you are really desperate run `du -hs / | sort -h` and go through the folders recursively until you've found something to delete'';
+            }
+            {
+              alert = "RootPartitionFull";
+              for = "30m";
+              expr = ''(node_filesystem_avail_bytes{alias="puyak",mountpoint="/"} * 100) / node_filesystem_size_bytes{alias="puyak",mountpoint="/"} < ${disk_free_threshold}'';
+              labels.severity = "warning";
+              annotations.summary = "{{ $labels.alias }} root disk full";
+              annotations.url = "http://grafana.shack/";
+              annotations.description = ''The root disk of {{ $labels.alias }} has {{ $value | printf "%.2f" }}% free disk space (Threshold at ${disk_free_threshold}%).Prometheus will not be able to create new alerts and CI for deploying new configuration will also seize working. Log in to the system and run `nix-collect-garbage -d` and if this does not help you can check `du -hs /var/ | sort -h`, run `docker system prune` or if you are really desperate run `du -hs / | sort -h` and go through the folders recursively until you've found something to delete'';
+            }
+            {
+              alert = "HostDown";
+              expr = ''up{alias="wolf"} == 0'';
+              for = "5m";
+              labels.severity = "page";
+              annotations.summary = "Instance {{ $labels.alias }} down for 5 minutes";
+              annotations.url = "http://grafana.shack/";
+              annotations.description = ''Host {{ $labels.alias }} went down and has not been reconnected after 5 minutes. This is probably bad news, try to restart the host via naproxen ( http://naproxen.shack:8006 ). Wolf being down means that CI,glados automation, light management and a couple of other services will not work anymore.'';
+            }
+          ];
+        }
+      ];
+    }
+  )];
 }
diff --git a/krebs/2configs/shack/prometheus/server.nix b/krebs/2configs/shack/prometheus/server.nix
index a10a43af..9e4b4d1a 100644
--- a/krebs/2configs/shack/prometheus/server.nix
+++ b/krebs/2configs/shack/prometheus/server.nix
@@ -1,6 +1,9 @@
 { pkgs, lib, config, ... }:
 # from https://gist.github.com/globin/02496fd10a96a36f092a8e7ea0e6c7dd
 {
+  imports = [
+    ./alert-rules.nix
+  ];
   networking = {
     firewall.allowedTCPPorts = [
       9090  # prometheus
@@ -18,12 +21,6 @@
     };
     prometheus = {
       enable = true;
-      ruleFiles = lib.singleton (pkgs.writeText "prometheus-rules.yml" (builtins.toJSON {
-            groups = lib.singleton {
-              name = "mf-alerting-rules";
-              rules = import ./alert-rules.nix { inherit lib; };
-            };
-          }));
       scrapeConfigs = [
         {
           job_name = "node";
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