```ruby
# Copyright 2017 Google Inc. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.


require "google/cloud/credentials"

module Google
  module Cloud
    module Debugger
      ##
      # @private Represents the OAuth 2.0 signing logic for Debugger.
      class Credentials < Google::Cloud::Credentials
        SCOPE = ["https://www.googleapis.com/auth/cloud_debugger"]
        PATH_ENV_VARS = %w(DEBUGGER_KEYFILE GOOGLE_CLOUD_KEYFILE GCLOUD_KEYFILE)
        JSON_ENV_VARS = %w(DEBUGGER_KEYFILE_JSON GOOGLE_CLOUD_KEYFILE_JSON
                           GCLOUD_KEYFILE_JSON)

        ##
        # @private Create credentials with given scope and/or keyfile
        def self.credentials_with_scope keyfile, scope = nil
          if keyfile.nil?
            default(scope: scope)
          else
            new(keyfile, scope: scope)
          end
        end
      end
    end
  end
end
```

Make debugger agent also authenticate with Logging scope
user
```ruby
# Copyright 2017 Google Inc. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.


require "google/cloud/credentials"

module Google
  module Cloud
    module Debugger
      ##
      # @private Represents the OAuth 2.0 signing logic for Debugger.
      class Credentials < Google::Cloud::Credentials
        SCOPE = ["https://www.googleapis.com/auth/cloud_debugger"] +
                Google::Cloud::Logging::Credentials::SCOPE
        PATH_ENV_VARS = %w(DEBUGGER_KEYFILE GOOGLE_CLOUD_KEYFILE GCLOUD_KEYFILE)
        JSON_ENV_VARS = %w(DEBUGGER_KEYFILE_JSON GOOGLE_CLOUD_KEYFILE_JSON
                           GCLOUD_KEYFILE_JSON)

        ##
        # @private Create credentials with given scope and/or keyfile
        def self.credentials_with_scope keyfile, scope = nil
          if keyfile.nil?
            default(scope: scope)
          else
            new(keyfile, scope: scope)
          end
        end
      end
    end
  end
end
```
assistant