feat: Optional include label value cardinality in /LabelNames

api/openapiv2/gen/phlare.swagger.json

@@ -1214,6 +1214,13 @@
           "items": {
             "type": "string"
           }
+        },
+        "estimatedCardinality": {
+          "type": "array",
+          "items": {
+            "type": "string",
+            "format": "int64"
+          }
         }
       }
     },

api/types/v1/types.proto

@@ -47,10 +47,12 @@ message LabelNamesRequest {
   repeated string matchers = 1;
   int64 start = 2;
   int64 end = 3;
+  optional bool include_cardinality = 4;
 }
 
 message LabelNamesResponse {
   repeated string names = 1;
+  repeated int64 estimated_cardinality = 2;
 }
 
 message BlockInfo {

load.js

@@ -0,0 +1,57 @@
+import http from 'k6/http';
+import { check } from 'k6';
+
+export let options = {
+  vus: 5,
+  duration: '10m',
+};
+
+export default function () {
+  // 24h query
+  const start = 1726473370933;
+  const end = 1726617370933;
+
+  const response = labelNamesRequest({
+    matchers: ["{service_name=\"fire-dev-001/querier\"}"],
+    start: start,
+    end: end
+  });
+
+  const names = response.json('names');
+  check(response, {
+    'Label names response is 200': (r) => r.status === 200,
+    'Label names response has data': (r) => names.length > 0,
+  });
+
+  for (let name of names) {
+    const response = labelValuesRequest({
+      matchers: [`{service_name=\"fire-dev-001/querier\", metric_name=\"${name}\"}`],
+      start: start,
+      end: end
+    });
+
+    const values = response.json('names');
+    check(response, {
+      'Label values response is 200': (r) => r.status === 200,
+      'Label values response has data': () => values !== undefined && values.length > 0,
+    });
+  }
+}
+
+function labelNamesRequest(body) {
+  return http.post('http://localhost:4100/querier.v1.QuerierService/LabelNames', JSON.stringify(body), {
+    headers: {
+      'Content-Type': 'application/json',
+      'X-Scope-OrgID': '1218'
+    },
+  });
+}
+
+function labelValuesRequest(body) {
+  return http.post('http://localhost:4100/querier.v1.QuerierService/LabelValues', JSON.stringify(body), {
+    headers: {
+      'Content-Type': 'application/json',
+      'X-Scope-OrgID': '1218'
+    },
+  });
+}