Add path attribute for jolokia module

[jguay]

https://jolokia.org/reference/html/protocol.html#read see 6.2.1.2 Post read request Request is to implement the key path.

Here is an example. This snippet returns 55 metrics :

             jmx.mappings:
               - mbean: 'java.lang:name=PS MarkSweep,type=GarbageCollector'
                 attributes:
                   - attr: "LastGcInfo"
                     field: GC.MarkSweep

But if we only want only this metric memoryUsageAfterGc.Metaspace.used. If the path argument would be implemented, it gives :

                   - attr: "CollectionCount"
                     field: GC.MarkSweep.CollectionCount
                     path: "memoryUsageAfterGc/Metaspace/used"

or I want only all memoryUsageAfterGc.Metaspace

                  - attr: "CollectionCount"
                     field: GC.MarkSweep.CollectionCount
                     path: "memoryUsageAfterGc/Metaspace"

or I want only all used metric

                   - attr: "CollectionCount"
                     field: GC.MarkSweep.CollectionCount
                     path: "*/*/used"

[jsoriano]

Another mention to this issue in discuss: https://discuss.elastic.co/t/jolokia-module-get-value-from-inner-path-substructure/210391

[botelastic[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[botelastic[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[botelastic[bot]]

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