Expose ovnkube_master_egress_routing_via_host via telemetry

[tssurya]

OVN-K openshift clusters have a metric called ovnkube_master_egress_routing_via_host in openshift-ovn-kubernetes namespace which conveys the gateway mode used by the users (values: 0/1/2). Cardinality is bounded, no labels for the metric so single time series. See https://docs.google.com/document/d/1pzabXpCIMo5e941g_F7vMOzVj8zy2xy4kFxeyIbRhPQ/edit for details.

cc @martinkennelly Metrics Area
cc @trozet SDN Team Lead

Note to reviewers: This is my first PR against CMO; so forgive blunders.

[npinaeva]

from the networking perspective
/lgtm

[martinkennelly]

/lgtm

[tssurya]

/test e2e-aws-single-node

[simonpasquier]

you need to run make generate locally and commit the modified files too :)

[tssurya]

you need to run make generate locally and commit the modified files too :)

oops my bad :D ack let me do this, thanks Simon!

[simonpasquier]

/lgtm
/test e2e-agnostic-upgrade

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: martinkennelly, npinaeva, simonpasquier, tssurya

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[tssurya]

/test e2e-agnostic-upgrade

[tssurya]

@simonpasquier : any idea how to get the required labels? Since this isn't a bug, I'd have to get the labels from each docs/px/qe teams? how does this work since generally those things come after the PR is merged...

[openshift-ci]

@tssurya: all tests passed!

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[simonpasquier]

@simonpasquier : any idea how to get the required labels? Since this isn't a bug, I'd have to get the labels from each docs/px/qe teams? how does this work since generally those things come after the PR is merged...

in this case, I can assign the labels myself.

/label qe-approved
/label docs-approved
/label px-approved