roles/prometheus/tasks/main.yml

@@ -18,8 +18,33 @@
     mode: u=r,g=r,o=
   loop:
     - prometheus.yml
-    - alert.rules.yml
+  notify: Restart Prometheus
+
+- name: Creates directory for alerts 
+  file:
+    path: /etc/prometheus/alerts
+    state: directory
+
+- name: Remove old files 
+  file:
+    path: "/etc/prometheus/{{ item }}"
+    state: absent
+  with_items:
+    - alerts.rules.yml
     - django.rules.yml
+
+- name: Configure Prometheus alerts
+  template:
+    src: "{{ item }}.j2"
+    dest: "/etc/prometheus/alerts/{{ item }}"
+    owner: prometheus
+    group: prometheus
+    mode: u=r,g=r,o=
+  loop:
+    - server.rules.yml
+    - django.rules.yml
+    - ups.rules.yml
+    - postgres.rules.yml
   notify: Restart Prometheus
 
 - name: Make Prometheus snmp-exporter listen on localhost only

roles/prometheus/templates/postgres.rules.yml.j2

@@ -0,0 +1,219 @@
+---
+{{ ansible_managed | comment }}
+
+{% macro raw(string) -%}
+{{ "{{" }} {{ string }} {{ "}}" }}
+{%- endmacro %}
+
+groups:
+
+  - name: postgres.rules
+    rules:
+      - alert: PostgresqlDown
+        expr: pg_up == 0
+        for: 0m
+        labels:
+          severity: critical
+        annotations:
+          summary: Serveur Postgresql down (instance {{ raw('$labels.instance') }})
+
+      - alert: PostgresqlRestarted
+        expr: time() - pg_postmaster_start_time_seconds < 60
+        for: 0m
+        labels:
+          severity: critical
+        annotations:
+          summary: Serveur Postgresql redémarré (instance {{ raw('$labels.instance') }})
+
+      - alert: PostgresqlExporterError
+        expr: pg_exporter_last_scrape_error > 0
+        for: 0m
+        labels:
+          severity: critical
+        annotations:
+          summary: Erreur dans l'exporter Postgresql (instance {{ raw('$labels.instance') }})
+
+      - alert: PostgresqlReplicationLag
+        expr:
+          pg_replication_lag > 30
+          and
+          ON(instance) pg_replication_is_replica == 1
+        for: 0m
+        labels:
+          severity: critical
+        annotations:
+          summary: >-
+            Réplication Postgresql lag ({{ raw('$value') }} > 30s)
+            (instance {{ raw('$labels.instance') }}, database {{ raw('$labels.datname')}} )
+
+      - alert: PostgresqlTableNotVaccumed
+        expr:
+          time() - pg_stat_user_tables_last_autovacuum
+          > 60 * 60 * 24
+        for: 0m
+        labels:
+          severity: warning
+        annotations:
+          summary: >-
+            La table n'a pas été aspirée depuis 24h
+            (Instance {{ raw('$labels.instance') }}, database {{ raw('$labels.datname') }} )
+
+      - alert: PostgresqlTableNotAnalyzed
+        expr:
+          time() - pg_stat_user_tables_last_autoanalyze
+          > 60 * 60 * 24
+        for: 0m
+        labels:
+          severity: warning
+        annotations:
+          summary: >-
+            Table non-analysée depuis 24h
+            (instance {{ raw('$labels.instance') }}, database {{ raw('$labels.datname') }})
+
+      - alert: PostgresqlTooManyConnections
+        expr:
+          (
+            sum by (datname)
+              (pg_stat_activity_count{datname!~"template.*|postgres"})
+          ) * 100
+          > pg_settings_max_connections * 80
+        for: 2m
+        labels:
+          severity: warning
+        annotations:
+          summary: >-
+            PostgreSQL a trop de connexions
+            ({{ raw('$value | printf "%.1f"') }} > 80%)
+            (instance {{ raw('$labels.instance') }}, database {{ raw('$labels.datname') }})
+
+      - alert: PostgresqlDeadLocks
+        expr: increase(pg_stat_database_deadlocks{datname!~"template.*|postgres"}[1m]) > 5
+        for: 0m
+        labels:
+          severity: warning
+        annotations:
+          summary: >-
+            PostgreSQL a des cadenas morts
+            (instance {{ raw('$labels.instance') }}, database {{ raw('$labels.datname') }} )
+
+      - alert: PostgresqlSlowQueries
+        expr: pg_slow_queries > 0
+        for: 2m
+        labels:
+          severity: warning
+        annotations:
+          summary: >-
+            Présence de requêtes lentes (slow-queries)
+            (instance {{ raw('$labels.instance') }}, database {{ raw('$labels.datname') }} )
+
+      - alert: PostgresqlHighRollbackRate
+        expr:
+          (
+            rate(pg_stat_database_xact_rollback{datname!~"template.*"}[3m]) /
+            rate(pg_stat_database_xact_commit{datname!~"template.*"}[3m])
+          ) * 100 
+          > 2
+        for: 0m
+        labels:
+          severity: warning
+        annotations:
+          summary: >-
+            Postgresql a un taux de retour en arrière (rollback) élevé
+            (instance {{ raw('$labels.instance') }}, database {{ raw('$labels.datname') }}, value {{ raw('$value | printf "%.1f"') }} %)
+
+      - alert: PostgresqlWaleReplicationStopped
+        expr: rate(pg_xlog_position_bytes[1m]) == 0
+        for: 0m
+        labels:
+          severity: critical
+        annotations:
+          summary: >-
+            Réplication de Postgresql WALE stopée
+            (instance {{ raw('$labels.instance') }}, database {{ raw('$labels.datname') }} )
+
+      - alert: PostgresqlHighRateStatementTimeout
+        expr: rate(postgresql_errors_total{type="statement_timeout"}[1m]) > 3
+        for: 0m
+        labels:
+          severity: critical
+        annotations:
+          summary: >-
+            Beaucoup de requêtes Postgresql sont timeout
+            (instance {{ raw('$labels.instance') }}, database {{ raw('$labels.datname') }}, value {{ raw('$value | printf "%.1f"') }} )
+
+      - alert: PostgresqlHighRateDeadlock
+        expr: increase(postgresql_errors_total{type="deadlock_detected"}[1m]) > 1
+        for: 0m
+        labels:
+          severity: critical
+        annotations:
+          summary: >-
+            Postgresql a un fort taux de deadlock
+            (instance {{ raw('$labels.instance') }}, database {{ raw('$labels.datname') }}, value {{ raw('$value | printf "%.1f"') }} )
+
+#      - alert: PostgresqlReplicationLagBytes
+#        expr:
+#          (pg_xlog_position_bytes and pg_replication_is_replica == 0)
+#          - GROUP_RIGHT(instance) (pg_xlog_position_bytes and pg_replication_is_replica == 1)
+#          > 1e+09
+#        for: 0m
+#        labels:
+#          severity: critical
+#        annotations:
+#          summary: La réplication Postgresql a des octets de retard (instance {{ raw('$labels.name') }}, value {{ raw('$value') }} )
+
+      - alert: PostgresqlTooManyDeadTuples
+        expr:
+          (
+            (pg_stat_user_tables_n_dead_tup > 10000)
+            / (pg_stat_user_tables_n_live_tup + pg_stat_user_tables_n_dead_tup)
+          ) >= 0.1 unless ON(instance) (pg_replication_is_replica == 1)
+        for: 2m
+        labels:
+          severity: warning
+        annotations:
+          summary: >-
+            Les tuples morts PostgreSQL sont trop volumineux
+            (instance {{ raw('$labels.instance') }}, database {{ raw('$labels.datname') }}, value {{ raw('$value | printf "%.1f"') }} )
+
+      - alert: PostgresqlSplitBrain
+        expr: count(pg_replication_is_replica == 0) != 1
+        for: 0m
+        labels:
+          severity: critical
+        annotations:
+          summary: >-
+            Split Brain, trop de bases de données Postgresql primaires en mode lecture-écriture
+            (instance {{ raw('$labels.instance') }}, database {{ raw('$labels.datname') }}, value {{ raw('$value') }} )
+
+      - alert: PostgresqlPromotedNode
+        expr:
+          pg_replication_is_replica
+          and
+          changes(pg_replication_is_replica[1m]) > 0
+        for: 0m
+        labels:
+          severity: warning
+        annotations:
+          summary: >-
+            Le serveur de secours PostgreSQL a été promu comme nœud principal
+            (instance {{ raw('$labels.instance') }}, database {{ raw('$labels.datname') }}, value {{ raw('$value') }})
+
+      - alert: PostgresqlTooManyLocksAcquired
+        expr:
+          (
+            (sum (pg_locks_count))
+            / (pg_settings_max_locks_per_transaction * pg_settings_max_connections)
+          ) * 100 > 20
+        for: 2m
+        labels:
+          severity: critical
+        annotations:
+          summary: >-
+            Trop de verrous acquis sur la base de données.
+            Si cette alerte se produit fréquemment, nous devrons peut-être augmenter
+            le paramètre postgres max_locks_per_transaction
+            (instance {{ raw('$labels.instance') }}, value = {{ raw('$value | printf "%.1f"') }} )
+
+...
+

roles/prometheus/templates/prometheus.yml.j2

@@ -20,8 +20,7 @@ alerting:
 
 # Load rules once and periodically evaluate them according to the global 'evaluation_interval'.
 rule_files:
-  - "alert.rules.yml"  # Monitoring alerts, this is the file you may be searching!
+  - "alerts/*.yml"  # Monitoring alerts, this is the file you may be searching!
-  - "django.rules.yml"  # Custom rules specific for Django project monitoring
 
 # A scrape configuration containing exactly one endpoint to scrape:
 # Here it's Prometheus itself.

roles/prometheus/templates/server.rules.yml.j2

@@ -7,7 +7,7 @@
 
 groups:
 
-  - name: alert.rules
+  - name: server.rules
     rules:
 
       - alert: InstanceDown
@@ -149,78 +149,5 @@ groups:
           summary: >
             Charge à {{ raw('$value') }}
       
-      - alert: UpsOutputSourceChanged
-        expr: upsOutputSource != 3
-        for: 0m
-        labels:
-          severity: critical
-        annotations:
-          summary: >-
-            Source d'alimentation changée
-
-      - alert: UpsBatteryStatus
-        expr: upsBatteryStatus == 3
-        for: 0m
-        labels:
-          severity: warning
-        annotations:
-          summary: >-
-            État de la batterie faible
-
-      - alert: UpsBatteryStatus
-        expr: upsBatteryStatus == 4
-        for: 0m
-        labels:
-          severity: critical
-        annotations:
-          summary: >-
-            État de la batterie critique
-
-      - alert: UpsHighLoad
-        expr: upsOutputPercentLoad > 70
-        for: 3m
-        labels:
-          severity: critical
-        annotations:
-          summary: >-
-            Charge de {{ raw('$value | printf "%.1f"') }}%
-
-      - alert: UpsWrongInputVoltage
-        expr: (upsInputVoltage < 210) or (upsInputVoltage > 250)
-        for: 5m
-        labels:
-          severity: warning
-        annotations:
-          summary: >-
-            Tension d'entrée de {{ raw('$value') }}V
-
-      - alert: UpsWrongOutputVoltage
-        expr: >-
-          abs(upsInputVoltage - avg_over_time(upsOutputVoltage[1d]))
-            < 3 * stddev_over_time(upsOutputVoltage[1d])
-        for: 5m
-        labels:
-          severity: warning
-        annotations:
-          summary: >-
-            Tension de sortie de {{ raw('$value') }}V
-
-      - alert: UpsTimeRemaining
-        expr: upsEstimatedMinutesRemaining < 8
-        for: 0m
-        labels:
-          severity: warning
-        annotations:
-          summary: >-
-            Autonomie restante de {{ raw('$value') }} min
-
-      - alert: UpsTimeRemaining
-        expr: upsEstimatedMinutesRemaining < 5
-        for: 0m
-        labels:
-          severity: critical
-        annotations:
-          summary: >-
-            Autonomie restante de {{ raw('$value') }} min
 
 ...

roles/prometheus/templates/ups.rules.yml.j2

@@ -0,0 +1,87 @@
+---
+{{ ansible_managed | comment }}
+
+{% macro raw(string) -%}
+{{ "{{" }} {{ string }} {{ "}}" }}
+{%- endmacro %}
+
+groups:
+
+  - name: ups.rules
+    rules:
+
+      - alert: UpsOutputSourceChanged
+        expr: upsOutputSource != 3
+        for: 0m
+        labels:
+          severity: critical
+        annotations:
+          summary: >-
+            Source d'alimentation changée
+
+      - alert: UpsBatteryStatus
+        expr: upsBatteryStatus == 3
+        for: 0m
+        labels:
+          severity: warning
+        annotations:
+          summary: >-
+            État de la batterie faible
+
+      - alert: UpsBatteryStatus
+        expr: upsBatteryStatus == 4
+        for: 0m
+        labels:
+          severity: critical
+        annotations:
+          summary: >-
+            État de la batterie critique
+
+      - alert: UpsHighLoad
+        expr: upsOutputPercentLoad > 70
+        for: 3m
+        labels:
+          severity: critical
+        annotations:
+          summary: >-
+            Charge de {{ raw('$value | printf "%.1f"') }}%
+
+      - alert: UpsWrongInputVoltage
+        expr: (upsInputVoltage < 210) or (upsInputVoltage > 250)
+        for: 5m
+        labels:
+          severity: warning
+        annotations:
+          summary: >-
+            Tension d'entrée de {{ raw('$value') }}V
+
+      - alert: UpsWrongOutputVoltage
+        expr: >-
+          abs(upsInputVoltage - avg_over_time(upsOutputVoltage[1d]))
+            < 3 * stddev_over_time(upsOutputVoltage[1d])
+        for: 5m
+        labels:
+          severity: warning
+        annotations:
+          summary: >-
+            Tension de sortie de {{ raw('$value') }}V
+
+      - alert: UpsTimeRemaining
+        expr: upsEstimatedMinutesRemaining < 8
+        for: 0m
+        labels:
+          severity: warning
+        annotations:
+          summary: >-
+            Autonomie restante de {{ raw('$value') }} min
+
+      - alert: UpsTimeRemaining
+        expr: upsEstimatedMinutesRemaining < 5
+        for: 0m
+        labels:
+          severity: critical
+        annotations:
+          summary: >-
+            Autonomie restante de {{ raw('$value') }} min
+
+...

roles/prometheus_postgres/tasks/main.yml.save

@@ -0,0 +1,21 @@
+---
+- name: Install Prometheus postgres-exporter
+  apt:
+    update_cache: true
+    name: prometheus-postgres-exporter
+  register: apt_result
+  retries: 3
+  until: apt_result is succeeded
+  when:
+    - ansible_lsb.codename != 'bullseye'
+
+# Doesn't work on Debian Stretch with the old prometheus package
+- name: Make Prometheus node-exporter listen on adm only
+  lineinfile:
+    path: /etc/default/prometheus-node-exporter
+    regexp: '^ARGS='
+    line: |
+      ARGS="--web.listen-address={{ ansible_hostname }}.adm.auro.re:9100"
+  notify: Restart prometheus-node-exporter
+
+git push --set-upstream origin add_ups_231