adds the degraded searches to the prometheus dashboard

assets/grafana-dashboard.json

@@ -238,6 +238,70 @@
       "title": "Total Searches (1h)",
       "type": "gauge"
     },
+    {
+      "datasource": {
+        "type": "prometheus"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "thresholds"
+          },
+          "mappings": [],
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              },
+              {
+                "color": "red",
+                "value": 80
+              }
+            ]
+          }
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 6,
+        "w": 4,
+        "x": 8,
+        "y": 1
+      },
+      "id": 26,
+      "options": {
+        "orientation": "auto",
+        "reduceOptions": {
+          "calcs": [
+            "lastNotNull"
+          ],
+          "fields": "",
+          "values": false
+        },
+        "showThresholdLabels": false,
+        "showThresholdMarkers": true,
+        "text": {}
+      },
+      "pluginVersion": "9.5.2",
+      "targets": [
+        {
+          "datasource": {
+            "type": "prometheus"
+          },
+          "editorMode": "builder",
+          "exemplar": true,
+          "expr": "round(increase(meilisearch_degraded_search_requests{job=\"$job\"}[1h]))",
+          "interval": "",
+          "legendFormat": "",
+          "range": true,
+          "refId": "A"
+        }
+      ],
+      "title": "Total Degraded Searches (1h)",
+      "type": "gauge"
+    },
     {
       "datasource": {
         "type": "prometheus"

meilisearch/src/metrics.rs

@@ -22,6 +22,11 @@ lazy_static! {
         &["method", "path"]
     )
     .expect("Can't create a metric");
+    pub static ref MEILISEARCH_DEGRADED_SEARCH_REQUESTS: IntGauge = register_int_gauge!(opts!(
+        "meilisearch_degraded_search_requests",
+        "Meilisearch number of degraded search requests"
+    ))
+    .expect("Can't create a metric");
     pub static ref MEILISEARCH_DB_SIZE_BYTES: IntGauge =
         register_int_gauge!(opts!("meilisearch_db_size_bytes", "Meilisearch DB Size In Bytes"))
             .expect("Can't create a metric");

meilisearch/src/routes/indexes/search.rs

@@ -17,6 +17,7 @@ use crate::analytics::{Analytics, SearchAggregator};
 use crate::extractors::authentication::policies::*;
 use crate::extractors::authentication::GuardedData;
 use crate::extractors::sequential_extractor::SeqHandler;
+use crate::metrics::MEILISEARCH_DEGRADED_SEARCH_REQUESTS;
 use crate::search::{
     add_search_rules, perform_search, HybridQuery, MatchingStrategy, SearchQuery, SemanticRatio,
     DEFAULT_CROP_LENGTH, DEFAULT_CROP_MARKER, DEFAULT_HIGHLIGHT_POST_TAG,
@@ -247,6 +248,9 @@ pub async fn search_with_post(
             .await?;
     if let Ok(ref search_result) = search_result {
         aggregate.succeed(search_result);
+        if search_result.degraded {
+            MEILISEARCH_DEGRADED_SEARCH_REQUESTS.inc();
+        }
     }
     analytics.post_search(aggregate);