diff --git a/src/append/opentelemetry.rs b/src/append/opentelemetry.rs
index 7a84d4a..c0539a9 100644
--- a/src/append/opentelemetry.rs
+++ b/src/append/opentelemetry.rs
@@ -80,16 +80,26 @@ impl OpentelemetryLogBuilder {
     }
 
     /// Add a label to the resource.
-    pub fn add_label(mut self, key: impl Into<Cow<'static, str>>, value: impl Into<Cow<'static, str>>) -> Self {
+    pub fn add_label(
+        mut self,
+        key: impl Into<Cow<'static, str>>,
+        value: impl Into<Cow<'static, str>>,
+    ) -> Self {
         self.labels.push((key.into(), value.into()));
         self
     }
 
     /// Build the [`OpentelemetryLog`] appender.
     pub fn build(self) -> Result<OpentelemetryLog, opentelemetry::logs::LogError> {
-        let OpentelemetryLogBuilder { name, endpoint, protocol, labels } = self;
+        let OpentelemetryLogBuilder {
+            name,
+            endpoint,
+            protocol,
+            labels,
+        } = self;
 
-        let collector_timeout = Duration::from_secs(opentelemetry_otlp::OTEL_EXPORTER_OTLP_TIMEOUT_DEFAULT);
+        let collector_timeout =
+            Duration::from_secs(opentelemetry_otlp::OTEL_EXPORTER_OTLP_TIMEOUT_DEFAULT);
         let exporter = match protocol {
             Protocol::Grpc => opentelemetry_otlp::new_exporter()
                 .tonic()
@@ -141,7 +151,7 @@ impl Append for OpentelemetryLog {
         let mut record = LogRecord::default();
         record.observed_timestamp = Some(SystemTime::now());
         record.severity_number = Some(log_level_to_otel_severity(log_record.level()));
-        record.severity_text = Some(log_record.level().as_str().into());
+        record.severity_text = Some(log_record.level().as_str());
         record.target = Some(log_record.target().to_string().into());
         record.body = Some(AnyValue::from(log_record.args().to_string()));
 
diff --git a/src/append/rolling_file/non_blocking.rs b/src/append/rolling_file/non_blocking.rs
index a668181..fc5cf95 100644
--- a/src/append/rolling_file/non_blocking.rs
+++ b/src/append/rolling_file/non_blocking.rs
@@ -117,7 +117,6 @@ impl NonBlocking {
     }
 
     pub(super) fn send(&self, record: Vec<u8>) -> anyhow::Result<()> {
-        // TODO(tisonkun): consider drop the message if the channel is full
         self.sender
             .send(Message::Record(record))
             .context("failed to send log message")