ReforgeHQ
diff --git a/‎.DS_Store‎
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diff --git a/‎.github/workflows/ruby.yml‎
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diff --git a/‎CHANGELOG.md‎
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diff --git a/‎Gemfile‎
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diff --git a/‎README.md‎
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diff --git a/‎VERSION‎
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diff --git a/‎lib/prefab_pb.rb‎
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diff --git a/‎lib/reforge/client.rb‎
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diff --git a/‎lib/reforge/internal_logger.rb‎
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@@ -23,7 +23,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby-version: ['3.1','3.2','3.3','3.4']
+        ruby-version: ['3.2','3.3','3.4']
 
     steps:
     - uses: actions/checkout@v4
 
@@ -1,5 +1,14 @@
 # Changelog
 
+## 1.12.0 - 2025-10-31
+
+- Restore log level functionality with LOG_LEVEL_V2 support
+- Make SemanticLogger optional - SDK now works with or without it
+- Add stdlib Logger support as alternative to SemanticLogger
+- Add InternalLogger that automatically uses SemanticLogger or stdlib Logger
+- Add `logger_key` initialization option for configuring dynamic log levels
+- Add `stdlib_formatter` method for stdlib Logger integration
+
 ## 1.11.2 - 2025-10-07
 
 - Address OpenSSL issue with vulnerability to truncation attack
 
@@ -9,8 +9,6 @@ gem 'uuid'
 
 gem 'activesupport', '>= 4'
 
-gem 'semantic_logger', '!= 4.16.0', require: "semantic_logger/sync"
-
 group :development do
   gem 'allocation_stats'
   gem 'benchmark-ips'
@@ -21,6 +19,7 @@ group :development do
 end
 
 group :test do
+  gem 'semantic_logger', '!= 4.16.0', require: "semantic_logger/sync"
   gem 'minitest'
   gem 'minitest-focus'
   gem 'minitest-reporters'
 
@@ -64,7 +64,107 @@ after_fork do |server, worker|
 end
 ```
 
+## Dynamic Log Levels
 
+Reforge supports dynamic log level management for Ruby logging frameworks. This allows you to change log levels in real-time without redeploying your application.
+
+Supported loggers:
+- SemanticLogger (optional dependency)
+- Ruby stdlib Logger
+
+### Setup with SemanticLogger
+
+Add semantic_logger to your Gemfile:
+
+```ruby
+# Gemfile
+gem "semantic_logger"
+```
+
+### Plain Ruby
+
+```ruby
+require "semantic_logger"
+require "sdk-reforge"
+
+client = Reforge::Client.new(
+  sdk_key: ENV['REFORGE_BACKEND_SDK_KEY'],
+  logger_key: 'log-levels.default' # optional, this is the default
+)
+
+SemanticLogger.sync!
+SemanticLogger.default_level = :trace # Reforge will handle filtering
+SemanticLogger.add_appender(
+  io: $stdout,
+  formatter: :json,
+  filter: client.log_level_client.method(:semantic_filter)
+)
+```
+
+### With Rails
+
+```ruby
+# Gemfile
+gem "amazing_print"
+gem "rails_semantic_logger"
+```
+
+```ruby
+# config/application.rb
+$reforge_client = Reforge::Client.new # reads REFORGE_BACKEND_SDK_KEY env var
+
+# config/initializers/logging.rb
+SemanticLogger.sync!
+SemanticLogger.default_level = :trace # Reforge will handle filtering
+SemanticLogger.add_appender(
+  io: $stdout,
+  formatter: Rails.env.development? ? :color : :json,
+  filter: $reforge_client.log_level_client.method(:semantic_filter)
+)
+```
+
+```ruby
+# puma.rb
+on_worker_boot do
+  SemanticLogger.reopen
+  Reforge.fork
+end
+```
+
+### With Ruby stdlib Logger
+
+If you're using Ruby's standard library Logger, you can use a dynamic formatter:
+
+```ruby
+require "logger"
+require "sdk-reforge"
+
+client = Reforge::Client.new(
+  sdk_key: ENV['REFORGE_BACKEND_SDK_KEY'],
+  logger_key: 'log-levels.default' # optional, this is the default
+)
+
+logger = Logger.new($stdout)
+logger.level = Logger::DEBUG # Set to most verbose level, Reforge will handle filtering
+logger.formatter = client.log_level_client.stdlib_formatter('MyApp')
+```
+
+The formatter will check dynamic log levels from Reforge and only output logs that meet the configured threshold.
+
+### Configuration
+
+In Reforge Launch, create a `LOG_LEVEL_V2` config with your desired key (default: `log-levels.default`). The config will be evaluated with the following context:
+
+```ruby
+{
+  "reforge-sdk-logging" => {
+    "lang" => "ruby",
+    "logger-path" => "your_app.your_class" # class name converted to lowercase with dots
+  }
+}
+```
+
+You can set different log levels for different classes/modules using criteria on the `reforge-sdk-logging.logger-path` property.
 
 ## Contributing to reforge sdk for ruby
 
 
@@ -1 +1 @@
-1.11.2
+1.12.0
@@ -53,6 +53,10 @@ def feature_flag_client
       @feature_flag_client ||= Reforge::FeatureFlagClient.new(self)
     end
 
+    def log_level_client
+      @log_level_client ||= Reforge::LogLevelClient.new(self)
+    end
+
     def context_shape_aggregator
       return nil if @options.collect_max_shapes <= 0
 
 
@@ -1,43 +1,173 @@
-module Reforge
-  class InternalLogger < SemanticLogger::Logger
+# frozen_string_literal: true
 
+module Reforge
+  # Internal logger for the Reforge SDK
+  # Uses SemanticLogger if available, falls back to stdlib Logger
+  class InternalLogger
     def initialize(klass)
-      default_level = ENV['REFORGE_LOG_CLIENT_BOOTSTRAP_LOG_LEVEL'] ? ENV['REFORGE_LOG_CLIENT_BOOTSTRAP_LOG_LEVEL'].downcase.to_sym : :warn
-      super(klass, default_level)
+      @klass = klass
+      @level_sym = nil # Track the symbol level for consistency
+
+      if defined?(SemanticLogger)
+        @logger = create_semantic_logger
+        @using_semantic = true
+      else
+        @logger = create_stdlib_logger
+        @using_semantic = false
+      end
+
+      # Track all instances regardless of logger type
       instances << self
     end
 
-    def log(log, message = nil, progname = nil, &block)
-      return if recurse_check[local_log_id]
-      recurse_check[local_log_id] = true
-      begin
-        super(log, message, progname, &block)
-      ensure
-        recurse_check[local_log_id] = false
+    # Log methods
+    def trace(message = nil, &block)
+      log_message(:trace, message, &block)
+    end
+
+    def debug(message = nil, &block)
+      log_message(:debug, message, &block)
+    end
+
+    def info(message = nil, &block)
+      log_message(:info, message, &block)
+    end
+
+    def warn(message = nil, &block)
+      log_message(:warn, message, &block)
+    end
+
+    def error(message = nil, &block)
+      log_message(:error, message, &block)
+    end
+
+    def fatal(message = nil, &block)
+      log_message(:fatal, message, &block)
+    end
+
+    def level
+      if @using_semantic
+        @logger.level
+      else
+        # Return the symbol level we tracked, or map from Logger constant
+        @level_sym || case @logger.level
+                     when Logger::DEBUG then :debug
+                     when Logger::INFO then :info
+                     when Logger::WARN then :warn
+                     when Logger::ERROR then :error
+                     when Logger::FATAL then :fatal
+                     else :warn
+                     end
       end
     end
 
-    def local_log_id
-      Thread.current.__id__
+    def level=(new_level)
+      if @using_semantic
+        @logger.level = new_level
+      else
+        # Track the symbol level for consistency
+        @level_sym = new_level
+
+        # Map symbol to Logger constant
+        @logger.level = case new_level
+                       when :trace, :debug then Logger::DEBUG
+                       when :info then Logger::INFO
+                       when :warn then Logger::WARN
+                       when :error then Logger::ERROR
+                       when :fatal then Logger::FATAL
+                       else Logger::WARN
+                       end
+      end
     end
 
     # Our client outputs debug logging,
     # but if you aren't using Reforge logging this could be too chatty.
     # If you aren't using reforge log filter, only log warn level and above
     def self.using_reforge_log_filter!
-      @@instances.each do |l|
-        l.level = :trace
+      @@instances&.each do |logger|
+        logger.level = :trace
       end
     end
 
     private
 
-    def instances
-      @@instances ||= []
+    def create_semantic_logger
+      default_level = env_log_level || :warn
+      logger = SemanticLogger::Logger.new(@klass, default_level)
+
+      # Wrap to prevent recursion
+      class << logger
+        def log(log, message = nil, progname = nil, &block)
+          return if recurse_check[local_log_id]
+          recurse_check[local_log_id] = true
+          begin
+            super(log, message, progname, &block)
+          ensure
+            recurse_check[local_log_id] = false
+          end
+        end
+
+        def local_log_id
+          Thread.current.__id__
+        end
+
+        private
+
+        def recurse_check
+          @recurse_check ||= Concurrent::Map.new(initial_capacity: 2)
+        end
+      end
+
+      logger
+    end
+
+    def create_stdlib_logger
+      require 'logger'
+      # When using stdlib Logger (no SemanticLogger), write to $stderr only
+      # Tests use $logs for SemanticLogger-filtered output, not stdlib Logger
+      logger = Logger.new($stderr)
+
+      # When SemanticLogger is not available, default to :warn to match SemanticLogger behavior
+      default_level_sym = :warn
+      @level_sym = env_log_level || default_level_sym
+
+      logger.level = case @level_sym
+                    when :trace, :debug then Logger::DEBUG
+                    when :info then Logger::INFO
+                    when :warn then Logger::WARN
+                    when :error then Logger::ERROR
+                    when :fatal then Logger::FATAL
+                    else Logger::WARN
+                    end
+      logger.progname = @klass.to_s
+
+      # Use a custom formatter that mimics SemanticLogger format
+      # SemanticLogger format: "ClassName -- Message"
+      # This helps tests that expect SemanticLogger-style output
+      logger.formatter = proc do |severity, datetime, progname, msg|
+        "#{progname} -- #{msg}\n"
+      end
+
+      logger
+    end
+
+    def env_log_level
+      level_str = ENV['REFORGE_LOG_CLIENT_BOOTSTRAP_LOG_LEVEL']
+      level_str&.downcase&.to_sym
     end
 
-    def recurse_check
-      @recurse_check ||=Concurrent::Map.new(initial_capacity: 2)
+    def log_message(level, message, &block)
+      if @using_semantic
+        @logger.send(level, message, &block)
+      else
+        # stdlib Logger doesn't have trace
+        level = :debug if level == :trace
+        @logger.send(level, message || block&.call)
+      end
+    end
+
+    def instances
+      @@instances ||= []
     end
   end
 end