✨ Forward file sink helpers through configured logger

bitlogger/BitLogger_test.mbt

@@ -194,3 +194,40 @@ test "configured logger reports dropped_count for bounded queue" {
   inspect(logger.dropped_count(), content="2")
   inspect(logger.flush(), content="2")
 }
+
+test "configured logger exposes file sink observability helpers" {
+  let logger = build_logger(
+    LoggerConfig::new(
+      sink=SinkConfig::new(kind=SinkKind::File, path="config-file.log"),
+    ),
+  )
+  inspect(logger.file_available() == native_files_supported(), content="true")
+  inspect(logger.file_open_failures(), content=if logger.file_available() { "0" } else { "1" })
+  inspect(logger.file_write_failures(), content="0")
+  inspect(logger.file_flush_failures(), content="0")
+  inspect(logger.file_rotation_failures(), content="0")
+  ignore(logger.close())
+}
+
+test "configured logger can reopen built file sink" {
+  let logger = build_logger(
+    LoggerConfig::new(
+      sink=SinkConfig::new(kind=SinkKind::File, path="config-reopen.log"),
+    ),
+  )
+  if logger.file_available() {
+    inspect(logger.close(), content="true")
+    inspect(logger.file_reopen(), content="true")
+    inspect(logger.file_available(), content="true")
+    inspect(logger.file_open_failures(), content="0")
+    logger.info("reopened from config")
+    inspect(logger.file_write_failures(), content="0")
+    inspect(logger.close(), content="true")
+  } else {
+    inspect(logger.file_open_failures(), content="1")
+    logger.info("dropped")
+    inspect(logger.file_write_failures(), content="1")
+    inspect(logger.file_reopen(), content="false")
+    inspect(logger.file_open_failures(), content="2")
+  }
+}

bitlogger/README.mbt.md

@@ -222,4 +222,5 @@ test {
 - JSON config uses `sink.rotation.max_bytes` and `sink.rotation.max_backups` / JSON 配置使用 `sink.rotation.max_bytes` 与 `sink.rotation.max_backups`
 - `FileSink::reopen()` can explicitly reopen the current file handle / `FileSink::reopen()` 可显式重开当前文件句柄
 - `open_failures()`、`write_failures()`、`flush_failures()`、`rotation_failures()` expose basic sink health counters / `open_failures()`、`write_failures()`、`flush_failures()`、`rotation_failures()` 可用于观察基础 sink 健康状态
+- `ConfiguredLogger` also forwards file reopen and failure-counter helpers for config-built file sinks / `ConfiguredLogger` 也会为配置生成的 file sink 转发 reopen 与失败计数访问器
 - current scope is observability-first, not a full self-healing sink runtime / 当前定位仍以可观测性优先，不是完整自愈型 sink runtime

bitlogger/config.mbt

@@ -223,6 +223,46 @@ pub fn RuntimeSink::file_available(self : RuntimeSink) -> Bool {
   }
 }
 
+pub fn RuntimeSink::file_reopen(self : RuntimeSink, append~ : Bool? = None) -> Bool {
+  match self {
+    File(sink) => sink.reopen(append=append)
+    QueuedFile(sink) => sink.sink.reopen(append=append)
+    _ => false
+  }
+}
+
+pub fn RuntimeSink::file_open_failures(self : RuntimeSink) -> Int {
+  match self {
+    File(sink) => sink.open_failures()
+    QueuedFile(sink) => sink.sink.open_failures()
+    _ => 0
+  }
+}
+
+pub fn RuntimeSink::file_write_failures(self : RuntimeSink) -> Int {
+  match self {
+    File(sink) => sink.write_failures()
+    QueuedFile(sink) => sink.sink.write_failures()
+    _ => 0
+  }
+}
+
+pub fn RuntimeSink::file_flush_failures(self : RuntimeSink) -> Int {
+  match self {
+    File(sink) => sink.flush_failures()
+    QueuedFile(sink) => sink.sink.flush_failures()
+    _ => 0
+  }
+}
+
+pub fn RuntimeSink::file_rotation_failures(self : RuntimeSink) -> Int {
+  match self {
+    File(sink) => sink.rotation_failures()
+    QueuedFile(sink) => sink.sink.rotation_failures()
+    _ => 0
+  }
+}
+
 pub type ConfiguredLogger = Logger[RuntimeSink]
 
 pub fn ConfiguredLogger::flush(self : ConfiguredLogger) -> Int {
@@ -249,6 +289,26 @@ pub fn ConfiguredLogger::file_available(self : ConfiguredLogger) -> Bool {
   self.sink.file_available()
 }
 
+pub fn ConfiguredLogger::file_reopen(self : ConfiguredLogger, append~ : Bool? = None) -> Bool {
+  self.sink.file_reopen(append=append)
+}
+
+pub fn ConfiguredLogger::file_open_failures(self : ConfiguredLogger) -> Int {
+  self.sink.file_open_failures()
+}
+
+pub fn ConfiguredLogger::file_write_failures(self : ConfiguredLogger) -> Int {
+  self.sink.file_write_failures()
+}
+
+pub fn ConfiguredLogger::file_flush_failures(self : ConfiguredLogger) -> Int {
+  self.sink.file_flush_failures()
+}
+
+pub fn ConfiguredLogger::file_rotation_failures(self : ConfiguredLogger) -> Int {
+  self.sink.file_rotation_failures()
+}
+
 fn expect_object(
   value : @json_parser.JsonValue,
   context : String,