Update fluentd-values.yaml

[omerfsen]

with current line ( logstash_prefix: 'kubernetes_cluster') it does not work and logs to default index called logstash so this fixes it.

What this PR does / why we need it:

There is nothing like logstash_prefix: 'kubernetes_cluster' (maybe old syntax) new one is like I have added.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[seldondev]

Hi @omerfsen. Thanks for your PR.

I'm waiting for a SeldonIO member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[seldondev]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[ryandawsonuk]

/lgtm
/approve

[ryandawsonuk]

/ok-to-test

[seldondev]

Fri Aug 21 08:26:57 UTC 2020
The logs for [pr-build] [1] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2306/1.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2306 --build=1

[seldondev]

Fri Aug 21 08:27:05 UTC 2020
The logs for [lint] [2] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2306/2.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2306 --build=2

[seldondev]

@omerfsen: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
lint	abfba9b	link	/test lint

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the jenkins-x/lighthouse repository. I understand the commands that are listed here.

[ryandawsonuk]

Failure looks like an unrelated problem. Seems the executor's go code is failing linting in master.

[ryandawsonuk]

Merging this as will look at linting under #2309