add a test

tests/integration/test_system_logs_hostname/configs/replicated_servers.xml

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+<clickhouse>
+	<remote_servers>
+		<test_cluster>
+			<shard>
+				<internal_replication>true</internal_replication>
+				<replica>
+					<host>node1</host>
+					<port>9000</port>
+				</replica>
+				<replica>
+					<host>node2</host>
+					<port>9000</port>
+				</replica>
+				<replica>
+					<host>node3</host>
+					<port>9000</port>
+				</replica>
+			</shard>
+		</test_cluster>
+	</remote_servers>
+	<query_log>
+		<database>system</database>
+		<table>query_log</table>
+		<partition_by>toYYYYMM(event_date)</partition_by>
+		<ttl>event_date + INTERVAL 30 DAY DELETE</ttl>
+		<!--
+        <engine>ENGINE = MergeTree PARTITION BY toYYYYMM(event_date) ORDER BY (event_date, event_time) SETTINGS index_granularity = 1024</engine>
+        -->
+		<flush_interval_milliseconds>100</flush_interval_milliseconds>
+		<reserved_size_rows>8192</reserved_size_rows>
+		<buffer_size_rows_flush_threshold>524288</buffer_size_rows_flush_threshold>
+		<flush_on_crash>false</flush_on_crash>
+	</query_log>
+</clickhouse>

tests/integration/test_system_logs_hostname/test_replicated.py

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+import pytest
+from helpers.cluster import ClickHouseCluster
+
+
+def fill_nodes(nodes, shard):
+    for node in nodes:
+        node.query(
+            """
+                CREATE DATABASE test;
+    
+                CREATE TABLE test.test_table(date Date, id UInt32)
+                ENGINE = ReplicatedMergeTree('/clickhouse/tables/test/{shard}/replicated/test_table', '{replica}') ORDER BY id PARTITION BY toYYYYMM(date);
+            """.format(
+                shard=shard, replica=node.name
+            )
+        )
+
+
+cluster = ClickHouseCluster(__file__)
+node1 = cluster.add_instance(
+    "node1", with_zookeeper=True, main_configs=["configs/replicated_servers.xml"]
+)
+node2 = cluster.add_instance(
+    "node2", with_zookeeper=True, main_configs=["configs/replicated_servers.xml"]
+)
+node3 = cluster.add_instance(
+    "node3", with_zookeeper=True, main_configs=["configs/replicated_servers.xml"]
+)
+
+
+@pytest.fixture(scope="module")
+def start_cluster():
+    try:
+        cluster.start()
+
+        fill_nodes([node1, node2, node3], 1)
+
+        yield cluster
+
+    except Exception as ex:
+        print(ex)
+
+    finally:
+        cluster.shutdown()
+
+
+def test_truncate_database_replicated(start_cluster):
+    node1.query("SELECT 1", query_id="query_node1")
+    node2.query("SELECT 1", query_id="query_node2")
+    node3.query("SELECT 1", query_id="query_node3")
+    node1.query("SYSTEM FLUSH LOGS")
+    node2.query("SYSTEM FLUSH LOGS")
+    node3.query("SYSTEM FLUSH LOGS")
+    assert (
+        node1.query(
+            "SELECT hostname from system.query_log  where query_id='query_node1' LIMIT 1"
+        )
+        == "node1\n"
+    )
+    assert (
+        node2.query(
+            "SELECT hostname from system.query_log  where query_id='query_node2' LIMIT 1"
+        )
+        == "node2\n"
+    )
+    assert (
+        node3.query(
+            "SELECT hostname from system.query_log  where query_id='query_node3' LIMIT 1"
+        )
+        == "node3\n"
+    )