Add otlploggrpc package documentation (#5622)

Part of #5056

This documentation is similar to [otlpmetricgrpc
doc](https://github.com/pellared/opentelemetry-go/blob/86bc5491872b5cef0ab56a9728976f1bad618a46/exporters/otlp/otlpmetric/otlpmetricgrpc/doc.go)

Author: XSAM

exporters/otlp/otlplog/otlploggrpc/doc.go

@@ -1,6 +1,58 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-// Package otlploggrpc provides an OTLP log exporter. The exporter uses gRPC to
-// transport OTLP protobuf payloads.
+/*
+Package otlploggrpc provides an OTLP log exporter using gRPC. The exporter uses gRPC to
+transport OTLP protobuf payloads.
+
+All Exporters must be created with [New].
+
+The environment variables described below can be used for configuration.
+
+OTEL_EXPORTER_OTLP_ENDPOINT, OTEL_EXPORTER_OTLP_LOGS_ENDPOINT (default: "https://localhost:4317") -
+target to which the exporter sends telemetry.
+The target syntax is defined in https://github.com/grpc/grpc/blob/master/doc/naming.md.
+The value must contain a host.
+The value may additionally contain a port, a scheme, and a path.
+The value accepts "http" and "https" scheme.
+The value should not contain a query string or fragment.
+OTEL_EXPORTER_OTLP_LOGS_ENDPOINT takes precedence over OTEL_EXPORTER_OTLP_ENDPOINT.
+The configuration can be overridden by [WithEndpoint], [WithEndpointURL], [WithInsecure], and [WithGRPCConn] options.
+
+OTEL_EXPORTER_OTLP_HEADERS, OTEL_EXPORTER_OTLP_LOGS_HEADERS (default: none) -
+key-value pairs used as gRPC metadata associated with gRPC requests.
+The value is expected to be represented in a format matching the [W3C Baggage HTTP Header Content Format],
+except that additional semi-colon delimited metadata is not supported.
+Example value: "key1=value1,key2=value2".
+OTEL_EXPORTER_OTLP_LOGS_HEADERS takes precedence over OTEL_EXPORTER_OTLP_HEADERS.
+The configuration can be overridden by [WithHeaders] option.
+
+OTEL_EXPORTER_OTLP_TIMEOUT, OTEL_EXPORTER_OTLP_LOGS_TIMEOUT (default: "10000") -
+maximum time in milliseconds the OTLP exporter waits for each batch export.
+OTEL_EXPORTER_OTLP_LOGS_TIMEOUT takes precedence over OTEL_EXPORTER_OTLP_TIMEOUT.
+The configuration can be overridden by [WithTimeout] option.
+
+OTEL_EXPORTER_OTLP_COMPRESSION, OTEL_EXPORTER_OTLP_LOGS_COMPRESSION (default: none) -
+the gRPC compressor the exporter uses.
+Supported value: "gzip".
+OTEL_EXPORTER_OTLP_LOGS_COMPRESSION takes precedence over OTEL_EXPORTER_OTLP_COMPRESSION.
+The configuration can be overridden by [WithCompressor], [WithGRPCConn] options.
+
+OTEL_EXPORTER_OTLP_CERTIFICATE, OTEL_EXPORTER_OTLP_LOGS_CERTIFICATE (default: none) -
+the filepath to the trusted certificate to use when verifying a server's TLS credentials.
+OTEL_EXPORTER_OTLP_LOGS_CERTIFICATE takes precedence over OTEL_EXPORTER_OTLP_CERTIFICATE.
+The configuration can be overridden by [WithTLSCredentials], [WithGRPCConn] options.
+
+OTEL_EXPORTER_OTLP_CLIENT_CERTIFICATE, OTEL_EXPORTER_OTLP_LOGS_CLIENT_CERTIFICATE (default: none) -
+the filepath to the client certificate/chain trust for client's private key to use in mTLS communication in PEM format.
+OTEL_EXPORTER_OTLP_LOGS_CLIENT_CERTIFICATE takes precedence over OTEL_EXPORTER_OTLP_CLIENT_CERTIFICATE.
+The configuration can be overridden by [WithTLSCredentials], [WithGRPCConn] options.
+
+OTEL_EXPORTER_OTLP_CLIENT_KEY, OTEL_EXPORTER_OTLP_LOGS_CLIENT_KEY (default: none) -
+the filepath to the client's private key to use in mTLS communication in PEM format.
+OTEL_EXPORTER_OTLP_LOGS_CLIENT_KEY takes precedence over OTEL_EXPORTER_OTLP_CLIENT_KEY.
+The configuration can be overridden by [WithTLSCredentials], [WithGRPCConn] option.
+
+[W3C Baggage HTTP Header Content Format]: https://www.w3.org/TR/baggage/#header-content
+*/
 package otlploggrpc // import "go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc"

exporters/otlp/otlplog/otlploggrpc/exporter.go

@@ -20,6 +20,7 @@ type logClient interface {
 
 // Exporter is a OpenTelemetry log Exporter. It transports log data encoded as
 // OTLP protobufs using gRPC.
+// All Exporters must be created with [New].
 type Exporter struct {
 	// Ensure synchronous access to the client across all functionality.
 	clientMu sync.Mutex