The `otel_trace` source is a source for the OpenTelemetry Collector. The following table describes options you can use to configure the `otel_trace` source.
<!--- What does otel_trace_source do? Other plugins include that in the overview section.--->
port | No | Integer | The port that the `otel_trace` source runs on. Default value is `21890`.
request_timeout | No | Integer | The request timeout, in milliseconds. Default value is `10000`.
health_check_service | No | Boolean | Enables a gRPC health check service under `grpc.health.v1/Health/Check`. Default value is `false`.
unauthenticated_health_check | No | Boolean | Determines whether or not authentication is required on the health check endpoint. Data Prepper ignores this option if no authentication is defined. Default value is `false`.
proto_reflection_service | No | Boolean | Enables a reflection service for Protobuf services (see [gRPC reflection](https://github.com/grpc/grpc/blob/master/doc/server-reflection.md) and [gRPC Server Reflection Tutorial](https://github.com/grpc/grpc-java/blob/master/documentation/server-reflection-tutorial.md) docs). Default value is `false`.
sslKeyCertChainFile | Conditionally | String | File system path or Amazon Simple Storage Service (Amazon S3) path to the security certificate (for example, `"config/demo-data-prepper.crt"` or `"s3://my-secrets-bucket/demo-data-prepper.crt"`). Required if `ssl` is set to `true`.
sslKeyFile | Conditionally | String | File system path or Amazon S3 path to the security key (for example, `"config/demo-data-prepper.key"` or `"s3://my-secrets-bucket/demo-data-prepper.key"`). Required if `ssl` is set to `true`.
useAcmCertForSSL | No | Boolean | Whether to enable TLS/SSL using a certificate and private key from AWS Certificate Manager (ACM). Default value is `false`.
acmCertificateArn | Conditionally | String | Represents the ACM certificate ARN. ACM certificate take preference over S3 or local file system certificate. Required if `useAcmCertForSSL` is set to `true`.
awsRegion | Conditionally | String | Represents the AWS region used by ACM or Amazon S3. Required if `useAcmCertForSSL` is set to `true` or `sslKeyCertChainFile` and `sslKeyFile` are Amazon S3 paths.
authentication | No | Object | An authentication configuration. By default, an unauthenticated server is created for the pipeline. This parameter uses pluggable authentication for HTTPS. To use basic authentication, define the `http_basic` plugin with a `username` and `password`. To provide customer authentication, use or create a plugin that implements [GrpcAuthenticationProvider](https://github.com/opensearch-project/data-prepper/blob/main/data-prepper-plugins/armeria-common/src/main/java/com/amazon/dataprepper/armeria/authentication/GrpcAuthenticationProvider.java).
