Possibility to extract parts of a json-message.

[opensource21]

Added the possibility to extract parts of a given json.

[tksm]

@opensource21 Hi, thank you for the PR.

Could you provide an example of the log and its expected output? I'm not entirely clear on the specific use case for this PR.

[opensource21]

If you log for ELK-Stack the log looks like this with stern k5s-open-id-sync-operator --tail 1 --no-follow -A --template '{{.PodName}} | {{.Message}}{{"\n"}}'

+ middleware k5s-open-id-sync-operator-7b658c4694-tjksw › k5s-open-id-sync-operator
k5s-open-id-sync-operator-7b658c4694-tjksw | {"@timestamp":"2023-07-10T16:26:21.389Z","ecs.version":"1.2.0","log.level":"ERROR","message":"Exhausted retries for ExecutionScope{ resource id: ResourceID{name='k5s-config-server', namespace='middleware'}, version: 1432}","process.thread.name":"ReconcilerExecutor-serviceaccountreconciler-74","log.logger":"io.javaoperatorsdk.operator.processing.event.EventProcessor","resource.apiVersion":"v1","resource.kind":"ServiceAccount","resource.name":"k5s-config-server","resource.namespace":"middleware","resource.resourceVersion":"1432","resource.uid":"55428d6d-ab2a-43cc-9f3a-b2343c3d60b3","service.name":"k5s-open-id-sync-operator","service.version":"1.0.0"}
- middleware k5s-open-id-sync-operator-7b658c4694-tjksw › k5s-open-id-sync-operator

With mystern k5s-open-id-sync-operator --tail 1 --no-follow -A --template '{{.PodName}} | {{tryExtractJSONParts .Message "message" "service.name"}}{{"\n"}}' it looks

+ middleware k5s-open-id-sync-operator-7b658c4694-tjksw › k5s-open-id-sync-operator
k5s-open-id-sync-operator-7b658c4694-tjksw | Exhausted retries for ExecutionScope{ resource id: ResourceID{name='k5s-config-server', namespace='middleware'}, version: 1432}, k5s-open-id-sync-operator
- middleware k5s-open-id-sync-operator-7b658c4694-tjksw › k5s-open-id-sync-operator

I hope this makes it more clear

[tksm]

Thank you for the explanation! Now I understand the use-case of these helpers.

[tksm]

LGTM

[opensource21]

Thanks for the great support. Any timeline for the next release?

[tksm]

Thank you for your contribution!
Normally, we release updates in sync with Kubernetes minor releases. The next version is planned to be released after Kubernetes v1.28.0, which is expected to be out within one or two months.