how to use monitor in dubbo 2.7.3

[SparkandScala]

• I have searched the issues of this repository and believe that this is not a duplicate.
• I have checked the FAQ of this repository and believe that this is not a duplicate.

Environment

• Dubbo version: 2.7.3
• Operating System version: Mac
• Java version: 1.8
• Dubbo-admin version: 0.2.0

Steps to reproduce this issue

i install the dubbo-admin-0.2.0 for dubbo 2.7.3, but i can't get the metrics in the statics page.

i want to know how to get the metrics in the page.

[iwhalecloud-platform]

if you use XML configuration mode:

    <dubbo:metrics port="20880" protocol="dubbo" />
    <dubbo:provider filter="metrics" />

    <dubbo:metrics port="20880" protocol="dubbo"/>
    <dubbo:consumer filter="metrics" />

if you use BOOT configuration mode(2.7.4 support):

dubbo.provider.filter=metrics
dubbo.metrics.protocol=dubbo
dubbo.metrics.port=20880

dubbo.consumer.filter=metrics
dubbo.metrics.protocol=dubbo
dubbo.metrics.port=20880

[SparkandScala]

why the dubbo-admin show "Metrics will release later"?