Adding prom annotations for feedback metrics server example

[SachinVarghese]

What this PR does / why we need it:
This PR adds prom annotations for feedback metrics server example so that the metrics are scraped by seldon core analytics Prometheus at regular intervals

Does this PR introduce a user-facing change?:
NONE

[seldondev]

Thu Oct 22 14:21:02 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-2572/1.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2572 --build=1

[seldondev]

Thu Oct 22 14:21:18 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-2572/2.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2572 --build=2

[axsaucedo]

/approve

[seldondev]

Thu Oct 22 14:44:32 UTC 2020
The logs for [lint] [4] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2572/4.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2572 --build=4

[seldondev]

Thu Oct 22 14:44:34 UTC 2020
The logs for [pr-build] [3] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2572/3.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2572 --build=3

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: axsaucedo

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