ES|QL: Add (stack) telemetry for views

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/action/EsqlCapabilities.java

@@ -1209,6 +1209,10 @@ public enum Cap {
          * Views with branching (requires subqueries/FORK).
          */
         VIEWS_WITH_BRANCHING(VIEWS_WITH_NO_BRANCHING.isEnabled() && SUBQUERY_IN_FROM_COMMAND.isEnabled()),
+        /**
+         * Added telemetry for views
+         */
+        VIEWS_TELEMETRY,
 
         /**
          * Support for the {@code leading_zeros} named parameter.

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/session/EsqlSession.java

@@ -98,6 +98,7 @@
 import org.elasticsearch.xpack.esql.planner.premapper.PreMapper;
 import org.elasticsearch.xpack.esql.plugin.ComputeService;
 import org.elasticsearch.xpack.esql.plugin.TransportActionServices;
+import org.elasticsearch.xpack.esql.telemetry.FeatureMetric;
 import org.elasticsearch.xpack.esql.telemetry.Metrics;
 import org.elasticsearch.xpack.esql.telemetry.PlanTelemetry;
 import org.elasticsearch.xpack.esql.view.ViewResolver;
@@ -276,7 +277,13 @@ private void analyseAndExecute(
         ActionListener<Versioned<Result>> listener
     ) {
         assert ThreadPool.assertCurrentThreadPool(ThreadPool.Names.SEARCH);
+
+        // this is stack telemetry
+        gatherViewMetrics(viewResolution);
+
+        // this is APM
         gatherPlanTelemetry(viewResolution.plan(), statement.settings());
+
         PlanTimeProfile planTimeProfile = request.profile() ? new PlanTimeProfile() : null;
 
         ZoneId timeZone = request.timeZone() == null
@@ -761,6 +768,13 @@ private void gatherSettingsMetrics(EsqlStatement statement) {
         statement.settings().stream().map(QuerySetting::name).distinct().forEach(metrics::incSetting);
     }
 
+    private void gatherViewMetrics(ViewResolver.ViewResolutionResult viewResolution) {
+        if (metrics == null || viewResolution.viewQueries().isEmpty()) {
+            return;
+        }
+        metrics.inc(FeatureMetric.VIEW);
+    }
+
     /**
      * Associates errors that occurred during field-caps with the cluster info in the execution info.
      * - Skips clusters that are no longer running, as they have already been marked as successful, skipped, or failed.

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/telemetry/FeatureMetric.java

@@ -104,6 +104,7 @@ public enum FeatureMetric {
     COMPLETION(Completion.class::isInstance),
     SAMPLE(Sample.class::isInstance),
     SUBQUERY(Subquery.class::isInstance),
+    VIEW(plan -> false), // Views are counted in EsqlSession.gatherViewMetrics, not via plan traversal
     MMR(MMR.class::isInstance),
     PROMQL(PromqlCommand.class::isInstance),
     URI_PARTS(UriParts.class::isInstance),

x-pack/plugin/src/yamlRestTest/resources/rest-api-spec/test/esql/60_usage.yml

@@ -97,6 +97,7 @@ setup:
   - set: { esql.features.completion: completion_counter }
   - set: { esql.features.sample: sample_counter }
   - set: { esql.features.subquery: subquery_counter }
+  - set: { esql.features.view: view_counter }
   - set: { esql.features.uri_parts: uri_parts_counter }
   - set: { esql.features.registered_domain: registered_domain_counter }
   - set: { esql.features.mmr: mmr_counter }
@@ -407,3 +408,40 @@ took:
   - exists: esql.took.lt_10h
   - exists: esql.took.lt_1d
   - exists: esql.took.gt_1d
+
+---
+"Views telemetry (snapshot only)":
+  - requires:
+      test_runner_features: [ capabilities ]
+      capabilities:
+        - method: POST
+          path: /_query
+          parameters: [ ]
+          capabilities: [ views_telemetry ]
+        - method: GET
+          path: /_query/view
+          capabilities: [ view_index_abstraction ]
+      reason: "Views telemetry test requires snapshot build with views enabled"
+
+  - do: { xpack.usage: { } }
+  - set: { esql.features.view: view_counter }
+  - set: { esql.features.subquery: subquery_counter }
+
+  - do:
+      esql.put_view:
+        name: test_view_for_telemetry
+        body:
+          query: 'FROM test | WHERE data > 0'
+
+  - do:
+      esql.query:
+        body:
+          query: 'FROM test_view_for_telemetry | LIMIT 10'
+
+  - do: { xpack.usage: { } }
+  - gt: { esql.features.view: $view_counter }
+  - match: { esql.features.subquery: $subquery_counter }
+
+  - do:
+      esql.delete_view:
+        name: test_view_for_telemetry