Update Helm release victoria-metrics-k8s-stack to v0.91.2

[renovate]

This PR contains the following updates:

Package	Update	Change
victoria-metrics-k8s-stack	minor	0.90.0 → 0.91.2

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Release Notes

VictoriaMetrics/helm-charts (victoria-metrics-k8s-stack)

v0.91.2

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Release notes for version 0.91.2

Release date: 22 Aug 2026

• fixed sync-job OUTPUT=- generating malformed YAML for ConfigMap manifests. See #​3169

v0.91.1

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Release notes for version 0.91.1

Release date: 21 Aug 2026

• fixed sync-job ignoring defaultRules.groups.<name>.spec overrides (e.g. interval). Per-group spec fields are now merged on top of the common group spec and applied to the generated VMRule. See #​3166

v0.91.0

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Release notes for version 0.91.0

Release date: 17 Aug 2026

• bump version of VM components to v1.150.0
• fixed sync-job deleting all rules and dashboards on upstream HTTP errors. The job now aborts on any fetch failure instead of treating missing data as orphaned resources. HTTP 429 is now retried like 5xx errors. See #​3163

v0.90.2

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Release notes for version 0.90.2

Release date: 08 Aug 2026

• fixed sync-job ignoring defaultRules.rules.<name>.enabled: false, causing disabled rules to reappear in generated VMRule resources. See #​3151

v0.90.1

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Release notes for version 0.90.1

Release date: 07 Aug 2026

• fixed sync-job silently ignoring extra fields set under defaultRules.group.spec (such as params and interval) and defaultRules.rules.*.spec. The configured values were not applied to the generated VMRule resources. See #​3149

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