chore: Add examples for logs (#1774)

* Example with the SDK, demonstrating the env var w/console export
* Example without the SDK using OTLP
* Example without the SDK using the console

examples/logs_sdk/logs_console.rb

@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+require 'bundler/inline'
+
+gemfile(true) do
+  source 'https://rubygems.org'
+
+  gem 'opentelemetry-logs-api', path: '../../logs_api'
+  gem 'opentelemetry-logs-sdk', path: '../../logs_sdk'
+end
+
+require 'opentelemetry-logs-sdk'
+
+# Create a LoggerProvider
+logger_provider = OpenTelemetry::SDK::Logs::LoggerProvider.new
+# Create a batching processor configured to export to the OTLP exporter
+processor = OpenTelemetry::SDK::Logs::Export::SimpleLogRecordProcessor.new(OpenTelemetry::SDK::Logs::Export::ConsoleLogRecordExporter.new)
+# Add the processor to the LoggerProvider
+logger_provider.add_log_record_processor(processor)
+# Access a Logger for your library from your LoggerProvider
+logger = logger_provider.logger(name: 'my_app_or_gem', version: '0.1.0')
+
+# Use your Logger to  emit a log record
+logger.on_emit(
+  timestamp: Time.now,
+  severity_text: 'INFO',
+  body: 'Thuja plicata',
+  attributes: { 'cedar' => true },
+)
+
+logger_provider.shutdown

examples/logs_sdk/logs_console_with_sdk.rb

@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+require 'bundler/inline'
+
+gemfile(true) do
+  source 'https://rubygems.org'
+
+  gem 'opentelemetry-sdk', path: '../../sdk'
+  gem 'opentelemetry-logs-api', path: '../../logs_api'
+  gem 'opentelemetry-logs-sdk', path: '../../logs_sdk'
+end
+
+require 'opentelemetry-sdk'
+require 'opentelemetry-logs-sdk'
+
+# Export logs to the console
+ENV['OTEL_LOGS_EXPORTER'] = 'console'
+
+# Configure SDK with defaults, this will apply the OTEL_LOGS_EXPORTER env var
+OpenTelemetry::SDK.configure
+
+# Access a Logger for your library from the LoggerProvider configured by the OpenTelemetry API
+logger = OpenTelemetry.logger_provider.logger(name: 'my_app_or_gem', version: '0.1.0')
+
+# Use your Logger to emit a log record
+logger.on_emit(
+  timestamp: Time.now,
+  severity_text: 'INFO',
+  body: 'Thuja plicata',
+  attributes: { 'cedar' => true },
+)

examples/logs_sdk/logs_otlp.rb

@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+require 'bundler/inline'
+
+gemfile(true) do
+  source 'https://rubygems.org'
+
+  gem 'opentelemetry-logs-api', path: '../../logs_api'
+  gem 'opentelemetry-logs-sdk', path: '../../logs_sdk'
+  gem 'opentelemetry-exporter-otlp-logs', path: '../../exporter/otlp-logs'
+end
+
+require 'opentelemetry-logs-sdk'
+require 'opentelemetry/exporter/otlp_logs'
+
+# Create a LoggerProvider
+logger_provider = OpenTelemetry::SDK::Logs::LoggerProvider.new
+# Create a batching processor configured to export to the OTLP exporter
+processor = OpenTelemetry::SDK::Logs::Export::BatchLogRecordProcessor.new(OpenTelemetry::Exporter::OTLP::Logs::LogsExporter.new)
+# Add the processor to the LoggerProvider
+logger_provider.add_log_record_processor(processor)
+# Access a Logger for your library from your LoggerProvider
+logger = logger_provider.logger(name: 'my_app_or_gem', version: '0.1.0')
+
+# Use your Logger to  emit a log record
+logger.on_emit(
+  timestamp: Time.now,
+  severity_text: 'INFO',
+  body: 'Thuja plicata',
+  attributes: { 'cedar' => true },
+)
+
+logger_provider.shutdown