SERVER-112221 Add execution control adjustment algorithm to serverStatus (#43096)

Co-authored-by: Pol Piñol Castuera <pol.pinol@mongodb.com>
GitOrigin-RevId: 9a86fde668cab7d898206f1792ff2a3ac6284b5f

jstests/noPassthrough/admission/concurrency_algorithm_reported_in_stats.js

@@ -0,0 +1,51 @@
+/**
+ * Checks the concurrency algorithm is reported on serverStatus.
+ *
+ * @tags: [
+ *      featureFlagMultipleTicketPoolsExecutionControl,
+ * ]
+ */
+
+import {ReplSetTest} from "jstests/libs/replsettest.js";
+
+const rst = new ReplSetTest({
+    nodes: 1,
+});
+
+rst.startSet();
+rst.initiate();
+
+const primary = rst.getPrimary();
+const db = primary.getDB(jsTestName());
+
+assert.commandWorked(
+    rst.getPrimary().adminCommand({
+        setParameter: 1,
+        storageEngineConcurrencyAdjustmentAlgorithm: "throughputProbing",
+    }),
+);
+
+let algorithm = db.serverStatus().queues.execution.storageEngineConcurrencyAdjustmentAlgorithm;
+assert.eq(2, algorithm);
+
+assert.commandWorked(
+    rst.getPrimary().adminCommand({
+        setParameter: 1,
+        storageEngineConcurrencyAdjustmentAlgorithm: "fixedConcurrentTransactionsWithPrioritization",
+    }),
+);
+
+algorithm = db.serverStatus().queues.execution.storageEngineConcurrencyAdjustmentAlgorithm;
+assert.eq(1, algorithm);
+
+assert.commandWorked(
+    rst.getPrimary().adminCommand({
+        setParameter: 1,
+        storageEngineConcurrencyAdjustmentAlgorithm: "fixedConcurrentTransactions",
+    }),
+);
+
+algorithm = db.serverStatus().queues.execution.storageEngineConcurrencyAdjustmentAlgorithm;
+assert.eq(0, algorithm);
+
+rst.stopSet();

src/mongo/db/admission/ticketing_system.cpp

@@ -356,6 +356,7 @@ void TicketingSystem::appendStats(BSONObjBuilder& b) const {
     boost::optional<BSONObjBuilder> writeStats;
     int32_t readOut = 0, readAvailable = 0, readTotalTickets = 0;
     int32_t writeOut = 0, writeAvailable = 0, writeTotalTickets = 0;
+    _state.loadRelaxed().appendStats(b);
     b.append("totalDeprioritizations", _opsDeprioritized.loadRelaxed());
 
     for (size_t i = 0; i < _holders.size(); ++i) {
@@ -536,5 +537,9 @@ bool TicketingSystem::TicketingState::isRuntimeResizable() const {
     return !usesThroughputProbing();
 }
 
+void TicketingSystem::TicketingState::appendStats(BSONObjBuilder& b) const {
+    b.append("storageEngineConcurrencyAdjustmentAlgorithm", algorithm);
+}
+
 }  // namespace admission
 }  // namespace mongo

src/mongo/db/admission/ticketing_system.h

@@ -193,6 +193,7 @@ private:
         bool usesPrioritization() const;
         bool usesThroughputProbing() const;
         bool isRuntimeResizable() const;
+        void appendStats(BSONObjBuilder& b) const;
     };
 
     /**