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Introduce a ScannerStartupDelay configuration to enable WAL write-only recovery, allowing fence messages to be persisted during primary–secondary switchover when the StreamingNode is trapped in crash loops. issue: https://github.com/milvus-io/milvus/issues/46368 <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **New Features** * Added a configurable WAL scanner pause/resume and a consumer request flag to optionally ignore pause signals. * **Metrics** * Added a scanner pause gauge and pause-duration tracking for WAL scanning. * **Tests** * Added coverage for pause-consumption behavior and cleanup in stream client tests. * **Chores** * Consolidated flush-all logging into a single field and added a helper for bulk message conversion. <sub>✏️ Tip: You can customize this high-level summary in your review settings.</sub> <!-- end of auto-generated comment: release notes by coderabbit.ai --> --------- Signed-off-by: bigsheeper <yihao.dai@zilliz.com>