fix(metrics): don't parse backup.status.size with an empty string

[derekbit]

Which issue(s) this PR fixes:

Issue longhorn/longhorn#10358

What this PR does / why we need it:

Special notes for your reviewer:

Additional documentation or context

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📥 Commits

Reviewing files that changed from the base of the PR and between b7700c2 and 1db3d95.

📒 Files selected for processing (5)

• k8s/crds.yaml (0 hunks)
• k8s/pkg/apis/longhorn/v1beta2/backup.go (1 hunks)
• metrics_collector/backup_collector.go (1 hunks)
• upgrade/upgrade.go (0 hunks)
• upgrade/v18xto190/upgrade.go (0 hunks)

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[mantissahz]

LGTM

[derekbit]

@mergify backport v1.8.x v1.7.x v1.6.x

[mergify]

backport v1.8.x v1.7.x v1.6.x

✅ Backports have been created

• #3555 fix(metrics): don't parse backup.status.size with an empty string (backport #3554) has been created for branch v1.8.x but encountered conflicts
• #3556 fix(metrics): don't parse backup.status.size with an empty string (backport #3554) has been created for branch v1.7.x but encountered conflicts
• #3557 fix(metrics): don't parse backup.status.size with an empty string (backport #3554) has been created for branch v1.6.x but encountered conflicts