Gate block-manager historical storage behind PROMPP feature flag#389

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fix/block-compactor-observability

Commits on Jun 26, 2026

Improve block compactor observability and range selection.

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cursoragent
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Add historical storage rollout feature gate via PROMPP_FEATURES.

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Add loaded block size distribution metric for legacy TSDB.

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Switch legacy TSDB loaded-block metric to duration buckets.

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Improve block duration observability for stage diagnostics.

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Use minute-based block duration buckets for observability.

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Log loaded blocks on block manager startup.

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Drive block compaction from the manager's single reload loop.

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Log the offending line on scraper UTF-8 validation failure.

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Compact until exhaustion within a single reload tick.

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Drop Grafana dashboard documentation changes.

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