Track telemetry download events for GET requests only

[kim-tsao]

Signed-off-by: Kim Tsao ktsao@redhat.com

Please specify the area for this PR
/area registry

What does does this PR do / why we need it:
The proxy endpoint handles GET and HEAD requests which is contributing to duplicate download calls (in some cases, like the go devfile). This should reduce the number of actions we're receiving in Segment

Which issue(s) this PR fixes:

Fixes #?
devfile/api#888

PR acceptance criteria:

• [x ] Test (WIP)

Documentation (WIP)

• Does the REST API doc need to be updated with your changes?
• Does the registry library doc need to be updated with your changes?

How to test changes / Special notes to the reviewer:

• built and deployed devfile-index image with fix and observed one download event passing through Segment for Go devfile (used odo init to trigger download)
• deployed latest prod devfile-index (without fix) and observed two download events for Go devfile, one download event for python and java-maven

[openshift-ci]

@kim-tsao: The label(s) area/registry cannot be applied, because the repository doesn't have them.

In response to this:

Signed-off-by: Kim Tsao ktsao@redhat.com

Please specify the area for this PR
/area registry

What does does this PR do / why we need it:
The proxy endpoint handles GET and HEAD requests which is contributing to duplicate download calls (in some cases, like the go devfile). This should reduce the number of actions we're receiving in Segment

Which issue(s) this PR fixes:

Fixes #?
devfile/api#888

PR acceptance criteria:

• [x ] Test (WIP)

Documentation (WIP)

• Does the REST API doc need to be updated with your changes?
• Does the registry library doc need to be updated with your changes?

How to test changes / Special notes to the reviewer:

• built and deployed devfile-index image with fix and observed one download event passing through Segment for Go devfile (used odo init to trigger download)
• deployed latest prod devfile-index (without fix) and observed two download events for Go devfile, one download event for python and java-maven

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: johnmcollier, kim-tsao

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