Remove Redundant Status Tag from EL Metrics

[khrm]

Removing the status tag from event_count and http_duration_seconds because it is always 200.

Changes

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Release Notes

Remove Redundant Status Tag from EventListener Metrics. 
Breaking Change:
Status label has been removed from metric eventlistener_http_duration_seconds_*. Please remove querying base on status label.

[dibyom]

@khrm This won't be a breaking change for any current users right?

[khrm]

@dibyom Good catch. This might be a breaking change if a user is using status while querying in metering system. I updated this in release section. Status field is needlessly increasing the cardinality without providing any benefit.

[dibyom]

@khrm Yeah, so I do not think the metrics is part of the beta API guarantees so we should be ok making this change even though it might be backwards incompatible? What do you think

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[khrm]

Yes, it is written in docs that it is experimental. So this is fine.

[savitaashture]

/lgtm