Add explicit end value when fetching Prometheus series

[ctolon22]

In some situations, setting end parameter as 0 may cause issues for some APIs, not from Prometheus but from tools implementing those APIs.

Adding explicitly the current timestamp as end parameter when fetching the Series.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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[dashpole]

/assign @dgrisonnet /triage accepted

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/lifecycle stale

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/lifecycle rotten

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/close

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@k8s-triage-robot: Closed this PR.

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/close

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