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issue: #43858 Enable dynamic configuration updates for ticker intervals without restart. This enhancement allows runtime configuration changes to take effect immediately for better operational flexibility. Changes include: - Apply "drain+Reset only when interval changed" pattern across all ticker components to preserve existing timing phases - Fix goroutine variable capture issue in CheckerController.Start() - Remove unnecessary ticker.Stop() in manual trigger paths - Add dynamic interval checking in QueryCoordV2 components: * checkers/controller.go: Various checker intervals * dist/dist_handler.go: DistPullInterval, CheckExecutedFlagInterval * session/cluster.go: CheckNodeSessionInterval * server.go: CheckAutoBalanceConfigInterval * observers/target_observer.go: UpdateNextTargetInterval * observers/collection_observer.go: CollectionObserverInterval - Add dynamic interval checking in QueryNodeV2 components: * segments/disk_usage_fetcher.go: DiskSizeFetchInterval - Ensure thread safety by performing all ticker operations in same goroutine with proper drain before Reset to avoid spurious triggers --------- Signed-off-by: Wei Liu <wei.liu@zilliz.com>