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我已添加statistics-enabled="true"到我的独立数据源中：

            <datasource jndi-name="java:jboss/datasources/RenavamDS"
                pool-name="RenavamDS" enabled="true" use-java-context="true" statistics-enabled="true">

但是当我尝试访问时http://localhost:9990/metrics，出现以下内部错误：

    ERROR [io.undertow.request]  (management I/O-1) UT005071: Undertow request failed HttpServerExchange{ GET /metrics}: java.lang.IllegalStateException: WFLYMETRICS0003: Unable to  read attribute second-level-cache-hit-count on [
    renavam-integrador-consulta_1  |     ("subsystem" => "jpa"),
    renavam-integrador-consulta_1  |     ("hibernate-persistence-unit" => "renavam-integrador-consulta.war#BaseCorrenteRenavamPersistenceUnit"),
    renavam-integrador-consulta_1  |     ("entity-cache" => "renavam.integrador.tabelas.domain.Especie")
    renavam-integrador-consulta_1  | ]: "WFLYCTL0158: Operation handler failed: java.lang.NullPointerException".

通过谷歌搜索（https://developer.jboss.org/thread/280621），我发现禁用 Hibernate 的二级缓存可以解决问题（在 persistence.xml 中）：

      <persistence-unit name="RenavamPersistenceUnit"
        transaction-type="JTA">
        <jta-data-source>java:jboss/datasources/RenavamDS</jta-data-source>
        <properties>
          <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect" />
           <property name="hibernate.cache.use_second_level_cache" value="false"/> 
        </properties>
      </persistence-unit>

但是仅仅为了获得一些指标而禁用“二级缓存”似乎并不明智。

任何人都知道如何在 Wildfly 17 中正确启用数据源的指标收集？我对 metric 特别感兴趣wildfly_datasources_pool_available_count。

太感谢了

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