[Draft] Added HTTP server metrics modes with bounded VictoriaMetrics histograms

[GoodforGod]

Added HTTP server metrics modes with bounded VictoriaMetrics histograms

EN

Added configurable HTTP server duration metric modes for summary, SLO, and VictoriaMetrics output. VM mode exports vmrange buckets through a Micrometer-backed collector while bounding exported bucket cardinality with metrics.vm.min, metrics.vm.max, and metrics.vm.buckets;

SLO mode remains the default.

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RU

Добавлены настраиваемые режимы метрик длительности HTTP server: summary, SLO и VictoriaMetrics. Режим VM отдает buckets через vmrange и ограничивает их количество настройками metrics.vm.min, metrics.vm.max и metrics.vm.buckets;

режим SLO остается значением по умолчанию.

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• Added summary, slo, and vm metrics modes for HTTP server duration metrics with slo as the default compatibility mode.
• Added VictoriaMetricsHistogram with native VM bucket ranges, exact _count and _sum, and bounded exported vmrange buckets per label set.
• Added nested VM configuration under metrics.vm with defaults min = 1ms, max = 90s, and buckets = 16.

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VictoriaMetrics Mode

Added VM histogram export for Prometheus-backed Micrometer registries. Values are recorded into the VM bucket grid, while scrape output is bounded by merging observed ranges outside or above the configured bucket limit.

httpServer.telemetry.metrics.mode = "vm"
httpServer.telemetry.metrics.vm.min = "1ms"
httpServer.telemetry.metrics.vm.max = "90s"
httpServer.telemetry.metrics.vm.buckets = 16