Hi Milan,
JMX is being maintained by serviceability these days.
I am forwarding your question there.
This is an interesting observation. JMX makes it possible to
define and use annotations on methods/getters/setters, to add
key/value pairs to the Descriptor of the corresponding
MBeanFeatureInfo.
The mechanism should probably be extended so that the standard
@Deprecated annotation is also reflected in the Descriptor.
best regards,
-- daniel
On 23/07/2020 13:25, Milan Mimica wrote:
Hello list
With deprecation of OperatingSystem#SystemCpuLoad in favor of
OperatingSystem#CpuLoad [1] an issue raised with generic tools that
query all MBean attributes. Querying CPU usage is not side-effect-free:
the immediate subsequent query for CPU load will often return a skewed
value (on Linux at least, haven't checked others)[2]. This results in
exported data where either new or deprecated MBean value is wrong and
misleading.
There are many tools and libraries that generically export JMX metrics,
so I think this should be addressed somehow. Maybe we could add a
property in MBeanAttributeInfo which would mark the attribute as
deprecated? These tools could then skip such metrics.
[1]
https://docs.oracle.com/en/java/javase/14/docs/api/jdk.management/com/sun/management/OperatingSystemMXBean.html#getSystemCpuLoad()
[2]
https://medium.com/@milan.mimica/the-java-cpu-usage-observer-effect-18808b18323f
--
Milan Mimica
