✨ Forward file sink helpers through configured logger

README.md

@@ -222,6 +222,7 @@ if native_files_supported() {
 - 已支持字段：`min_level`、`target`、`timestamp`、`sink.kind`、`sink.path`、`sink.append`、`sink.auto_flush`、`sink.rotation`、`sink.text_formatter`、`queue`
 - `sink.rotation` 当前支持 `max_bytes` 与 `max_backups`，提供基础 size-based rotation 和 backup retention
 - `file_sink(...)` 还提供 `reopen()`、`open_failures()`、`write_failures()`、`flush_failures()`、`rotation_failures()`，用于基础可观测性
+- `build_logger(...)` 产出的 `ConfiguredLogger` 同样提供 `file_reopen()` 与对应 file failure 计数访问器，便于配置式接入后继续运维控制
 - `sink.text_formatter.template` 当前支持固定 token：`{timestamp}`、`{timestamp_ms}`、`{level}`、`{target}`、`{message}`、`{fields}`
 - 当前可由配置直接组装的 sink 类型：`console`、`json_console`、`text_console`、`file`
 - `queue` 会作为显式包装层附着在最终 sink 外侧；这仍然是同步 drain 模型，不是 async runtime

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,

docs/README-en.md

@@ -207,6 +207,7 @@ if native_files_supported() {
 - Supported keys include `min_level`, `target`, `timestamp`, `sink.kind`, `sink.path`, `sink.append`, `sink.auto_flush`, `sink.rotation`, `sink.text_formatter`, and `queue`.
 - `sink.rotation` currently supports `max_bytes` and `max_backups` for basic size-based rotation and backup retention.
 - `file_sink(...)` also exposes `reopen()`, `open_failures()`, `write_failures()`, `flush_failures()`, and `rotation_failures()` for basic observability.
+- `ConfiguredLogger` built through `build_logger(...)` also exposes `file_reopen()` and the corresponding file failure counters, so config-driven file logging keeps a usable control surface.
 - `sink.text_formatter.template` currently supports fixed tokens: `{timestamp}`, `{timestamp_ms}`, `{level}`, `{target}`, `{message}`, and `{fields}`.
 - Config-driven sink assembly currently supports `console`, `json_console`, `text_console`, and `file`.
 - `queue` remains a synchronous bounded wrapper around the final sink, not an async runtime.

docs/changes/0.3.0.md

@@ -30,6 +30,7 @@ version 0.3.0
 - feat: add `FileRotation`, `file_rotation(...)`, and size-based file rotation with retained backups for `file_sink(...)`
 - feat: support `sink.rotation.max_bytes` and `sink.rotation.max_backups` in JSON logger config
 - feat: add `FileSink::reopen()` and basic file sink failure counters via `open_failures()`, `write_failures()`, and `flush_failures()`
+- feat: forward file sink reopen and failure-counter helpers through `RuntimeSink` and `ConfiguredLogger`
 - feat: add `SplitSink`, `split_sink(...)`, and `split_by_level(...)` for routing records into different sinks by predicate or level
 - feat: add `Logger::bind(...)` as an ergonomic context-binding alias and `fields(...)` helper for tuple-based field construction
 
@@ -44,6 +45,7 @@ version 0.3.0
 - test: cover template-based formatter rendering and disabled token behavior
 - test: cover file rotation config parsing, config roundtrip, and native rotation behavior
 - test: cover file sink reopen behavior and backend-dependent failure counter paths
+- test: cover config-built file logger reopen and failure-counter helper access
 - test: cover split sink predicate routing and level-based routing behavior
 - test: cover `bind(...)` context composition and `fields(...)` helper behavior
 - test: add async logger lifecycle, config roundtrip, and batching/flush policy test seeds
@@ -59,6 +61,7 @@ version 0.3.0
 - docs: update formatter examples to demonstrate template-based text rendering
 - docs: update file sink examples to demonstrate rotation and backup retention
 - docs: document file sink reopen and observability counters in README variants
+- docs: clarify that config-built file loggers keep file control and observability helpers
 - docs: add split sink examples for level-based routing
 - docs: add `bind(...)` examples for reusable context binding
 - docs: update root README and English README with async adapter notes and current scope