Remove zipkin service

[objectiser]

Originally the zipkin service was added to the jaeger-kubernetes template to provide a drop-in replacement for the zipkin deployment that was included as an addon within the Istio installation instructions.

Over time, the template was moved into the Istio helm chart, and a specific zipkin service was created to provide a "zipkin compatible" endpoint for any user selected tracing backend to support. However it was not removed from the upstream jaeger-kubernetes templates, which were no longer being used as part of the Istio installation.

The jaeger-collector provides access to the zipkin port, so I don't believe the jaeger templates/operator need to provide a separate service any more.

The main purpose of this change is that I am investigating the potential for using the jaeger-operator as part of the Istio helm installation - and it is now resulting in two "zipkin" related services being created. One representing the zipkin service that is used as the endpoint for all Istio components to report zipkin compatible tracing data to, and the other created by the operator e.g. <jaeger-instance-name>-zipkin.

As the jaeger-operator is still in early development, now would be a good time to clean up these issues. If users still require access to the zipkin service, separate from the jaeger-collector service, then it could always be added back in as an option.

Signed-off-by: Gary Brown gary@brownuk.com

[jpkrohling]

This change is 

[codecov]

Codecov Report

Merging #75 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #75      +/-   ##
==========================================
- Coverage   99.37%   99.34%   -0.03%     
==========================================
  Files          19       18       -1     
  Lines         801      769      -32     
==========================================
- Hits          796      764      -32     
  Misses          5        5

Impacted Files	Coverage Δ
pkg/deployment/all-in-one.go	100% <ø> (ø)	⬆️
pkg/deployment/collector.go	100% <ø> (ø)	⬆️

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[pavolloffay]

I think the original design was also to provide a smooth migration from https://github.com/fabric8io/kubernetes-zipkin to jaeger installation. We could expose the port by default and deploy the service based on the config option.

[jpkrohling]

Is this only about the Kubernetes service? The env var COLLECTOR_ZIPKIN_HTTP_PORT is still there in the deployment, but I think those have to stay there, right?

This LGTM and it all tests are passing, including the e2e tests:

ok  	github.com/jaegertracing/jaeger-operator/test/e2e	206.654s

Reviewed 9 of 9 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved

[objectiser]

@jpkrohling Yes only the service needs to be removed. If current users of the template find this to be an issue when switching to the operator, then we can added it back in as an option.