feat(monitoring): support GRPC LogExporter (#4808)

* feat(monitoring): support GRPC LogExporter

* Add dependency to `monitor-otlp`

* Pass through credentials

pyproject.toml

@@ -108,7 +108,10 @@ tracing = [
 tracing-jaeger = ["opentelemetry-exporter-jaeger==1.20.0"]
 tracing-zipkin = ["opentelemetry-exporter-zipkin==1.20.0"]
 tracing-otlp = ["opentelemetry-exporter-otlp==1.20.0"]
-monitor-otlp = ["opentelemetry-exporter-otlp-proto-http==1.20.0"]
+monitor-otlp = [
+    "opentelemetry-exporter-otlp-proto-http==1.20.0",
+    "opentelemetry-exporter-otlp-proto-grpc==1.20.0",
+]
 
 [build-system]
 requires = ['hatchling', "hatch-vcs>=0.3.0"]

src/bentoml/_internal/monitoring/otlp.py

@@ -27,7 +27,12 @@
 from .base import MonitorBase
 
 try:
-    from opentelemetry.exporter.otlp.proto.http._log_exporter import OTLPLogExporter
+    from opentelemetry.exporter.otlp.proto.grpc._log_exporter import (
+        OTLPLogExporter as OTLPGrpcLogExporter,
+    )
+    from opentelemetry.exporter.otlp.proto.http._log_exporter import (
+        OTLPLogExporter as OTLPHttpLogExporter,
+    )
 except ImportError:
     raise MissingDependencyException(
         "'opentelemetry-exporter-otlp' is required to use OTLP exporter. Make sure to install it with 'pip install \"bentoml[monitor-otlp]\""
@@ -106,6 +111,7 @@ def __init__(
         timeout: int | str | None = None,
         compression: str | None = None,
         meta_sample_rate: float = 1.0,
+        protocol: t.Literal["http", "grpc"] = "http",
         **_: t.Any,
     ) -> None:
         """
@@ -119,6 +125,7 @@ def __init__(
             headers: The headers to use.
             timeout: The timeout to use.
             compression: The compression to use.
+            protocol: The protocol to use.
         """
         super().__init__(name, **_)
 
@@ -135,6 +142,8 @@ def __init__(
         self._schema: dict[str, dict[str, str]] = {}
         self._will_export_schema = False
 
+        self.protocol = protocol
+
     def _init_logger(self) -> None:
         from opentelemetry.sdk.resources import SERVICE_INSTANCE_ID
         from opentelemetry.sdk.resources import SERVICE_NAME
@@ -169,7 +178,27 @@ def _init_logger(self) -> None:
         if self.compression is not None:
             os.environ[OTEL_EXPORTER_OTLP_COMPRESSION] = self.compression
 
-        exporter = OTLPLogExporter()
+        exporter: OTLPHttpLogExporter | OTLPGrpcLogExporter
+        if self.protocol == "http":
+            exporter = OTLPHttpLogExporter(
+                endpoint=self.endpoint,
+                certificate_file=self.credentials,
+                headers=self.headers,
+                timeout=self.timeout,
+                compression=self.compression,
+            )
+        elif self.protocol == "grpc":
+            exporter = OTLPGrpcLogExporter(
+                endpoint=self.endpoint,
+                insecure=self.insecure,
+                credentials=self.credentials,
+                headers=self.headers,
+                timeout=self.timeout,
+                compression=self.compression,
+            )
+        else:
+            raise ValueError(f"Invalid protocol: {self.protocol}")
+
         self.logger_provider.add_log_record_processor(BatchLogRecordProcessor(exporter))
         handler = LoggingHandler(
             level=logging.NOTSET, logger_provider=self.logger_provider