chore: import upstream snapshot with attribution

2026-07-13 13:11:39 +08:00
commit c8cebdfeee
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+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+Please move external libs to this folder only when you need external JDBC jars, for example:
+
+ojdbc8-21.5.0.0.jar
+orai18n-21.5.0.0.jar
+mysql-connector-java-8.0.30.jar
+
+Notes:
+
+- MySQL, MariaDB, OceanBase, and TiDB SQL query metrics can use the built-in MySQL-compatible query engine without `mysql-connector-j`.
+- If `mysql-connector-j` is present here, HertzBeat prefers JDBC after restart.
+- Oracle and DB2 still require external JDBC jars in `ext-lib`.