feat(observability): add d8_virtualization_virtualmachinesnapshot_info and d8_virtualization_virtualdisksnapshot_info prometheus metrics

[eofff]

Description

Add d8_virtualization_virtualmachinesnapshot_info and d8_virtualization_virtualdisksnapshot_info prometheus metrics.

Checklist

• The code is covered by unit tests.
• e2e tests passed.
• Documentation updated according to the changes.
• Changes were tested in the Kubernetes cluster manually.

Changelog entries

section: observability
type: feature
summary: Add snapshots info prometheus metrics.

[sourcery-ai]

Reviewer's Guide

This PR enhances the virtual machine snapshot monitoring by adding a new ‘virtualmachinesnapshot_info_virtualmachine’ metric, integrating it into the data model, metric registry, and scraper implementation.

Class diagram for updated dataMetric structure

classDiagram
class dataMetric {
  string Name
  string Namespace
  string UID
  v1alpha2.VirtualMachineSnapshotPhase Phase
  string VirtualMachine
}

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Class diagram for updated scraper methods

classDiagram
class scraper {
  Report(m *dataMetric)
  updateMetricVMSnapshotStatusPhase(m *dataMetric)
  updateMetricVMSnapshotVM(m *dataMetric)
  defaultUpdate(descName string, value float64, m *dataMetric, labels ...string)
}

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File-Level Changes

Change	Details	Files
Extend dataMetric to include the associated VirtualMachine name	Added a VirtualMachine field to dataMetric struct Populated VirtualMachine from vms.Spec.VirtualMachineName in newDataMetric	data_metric.go
Define and register new MetricVMSnapshotInfoVirtualMachine	Introduced MetricVMSnapshotInfoVirtualMachine constant Added new MetricInfo entry in vmsnapshotMetrics map	metrics.go
Update scraper to emit the new VM info metric	Called updateMetricVMSnapshotVM in scraper.Report Implemented updateMetricVMSnapshotVM invoking defaultUpdate with VM label	scraper.go

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