feat(meilisearch): add basic set of rules (#425)

* feat(meilisearch): add basic meilisearch rules

* fix(query): use == instead of =

* fix(data): set correct name and use ==

* chore(meilisearch): remove index filter

_data/rules.yml

@@ -842,6 +842,21 @@ groups:
                 query: "increase(redis_rejected_connections_total[1m]) > 0"
                 severity: critical
 
+      - name: Meilisearch
+        exporters:
+          - name: Embedded exporter
+            slug: embedded-exporter
+            doc_url: https://github.com/orgs/meilisearch/discussions/625
+            rules:                
+              - name: Meilisearch index is empty
+                description: Meilisearch instance is down
+                query: 'meilisearch_index_docs_count == 0'
+                severity: warning
+              - name: Meilisearch http response time
+                description: Meilisearch http response time is too high
+                query: "meilisearch_http_response_time_seconds > 0.5"
+                severity: warning
+
       - name: MongoDB
         exporters:
           - name: percona/mongodb_exporter

dist/rules/meilisearch/embedded-exporter.yml

@@ -0,0 +1,23 @@
+groups:
+
+- name: EmbeddedExporter
+
+  rules:
+
+    - alert: MeilisearchIndexIsEmpty
+      expr: meilisearch_index_docs_count == 0
+      for: 5m
+      labels:
+        severity: warning
+      annotations:
+        summary: the index {{ $labels.Index }} is empty
+        description: "The index {{ $labels.Index }} is empty at the moment, and shouldnt be empty\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
+        
+    - alert: MeilisearchHttpResponseTimeIsTooHigh
+      expr: rate(meilisearch_http_response_time_seconds_sum[5m]) / rate(meilisearch_http_response_time_seconds_count[5m]) > 0.5
+      for: 5m
+      labels:
+        severity: warning
+      annotations:
+        summary: the meilisearch server http response time is too high
+        description: "The meilisearch server http response time is too high at the moment\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"