Module: Appsignal

Extended by:
Gem::Deprecate
Defined in:
lib/appsignal.rb,
lib/appsignal/cli.rb,
lib/appsignal/demo.rb,
lib/appsignal/hooks.rb,
lib/appsignal/utils.rb,
lib/appsignal/config.rb,
lib/appsignal/marker.rb,
lib/appsignal/system.rb,
lib/appsignal/version.rb,
lib/appsignal/cli/demo.rb,
lib/appsignal/minutely.rb,
lib/appsignal/extension.rb,
lib/appsignal/auth_check.rb,
lib/appsignal/hooks/puma.rb,
lib/appsignal/hooks/rake.rb,
lib/appsignal/cli/helpers.rb,
lib/appsignal/cli/install.rb,
lib/appsignal/hooks/redis.rb,
lib/appsignal/transaction.rb,
lib/appsignal/transmitter.rb,
lib/appsignal/cli/diagnose.rb,
lib/appsignal/hooks/sequel.rb,
lib/appsignal/hooks/sidekiq.rb,
lib/appsignal/hooks/unicorn.rb,
lib/appsignal/hooks/net_http.rb,
lib/appsignal/event_formatter.rb,
lib/appsignal/hooks/celluloid.rb,
lib/appsignal/hooks/passenger.rb,
lib/appsignal/hooks/shoryuken.rb,
lib/appsignal/hooks/webmachine.rb,
lib/appsignal/hooks/data_mapper.rb,
lib/appsignal/hooks/delayed_job.rb,
lib/appsignal/hooks/action_cable.rb,
lib/appsignal/integrations/grape.rb,
lib/appsignal/integrations/resque.rb,
lib/appsignal/cli/notify_of_deploy.rb,
lib/appsignal/integrations/padrino.rb,
lib/appsignal/integrations/railtie.rb,
lib/appsignal/utils/params_sanitizer.rb,
lib/appsignal/hooks/mongo_ruby_driver.rb,
lib/appsignal/integrations/webmachine.rb,
lib/appsignal/rack/streaming_listener.rb,
lib/appsignal/integrations/data_mapper.rb,
lib/appsignal/js_exception_transaction.rb,
lib/appsignal/rack/js_exception_catcher.rb,
lib/appsignal/rack/rails_instrumentation.rb,
lib/appsignal/garbage_collection_profiler.rb,
lib/appsignal/rack/generic_instrumentation.rb,
lib/appsignal/rack/sinatra_instrumentation.rb,
lib/appsignal/utils/query_params_sanitizer.rb,
lib/appsignal/integrations/mongo_ruby_driver.rb,
lib/appsignal/integrations/resque_active_job.rb,
lib/appsignal/integrations/delayed_job_plugin.rb,
lib/appsignal/hooks/active_support_notifications.rb,
lib/appsignal/event_formatter/moped/query_formatter.rb,
lib/appsignal/event_formatter/faraday/request_formatter.rb,
lib/appsignal/integrations/capistrano/capistrano_2_tasks.rb,
lib/appsignal/event_formatter/active_record/sql_formatter.rb,
lib/appsignal/event_formatter/action_view/render_formatter.rb,
lib/appsignal/event_formatter/elastic_search/search_formatter.rb,
lib/appsignal/event_formatter/mongo_ruby_driver/query_formatter.rb,
lib/appsignal/event_formatter/active_record/instantiation_formatter.rb,
ext/appsignal_extension.c

Overview

AppSignal for Ruby gem's main module.

Provides method to control the AppSignal instrumentation and the system agent. Also provides instrumentation helpers for ease of use.

Defined Under Namespace

Modules: Grape, Integrations, Rack, System, Utils Classes: AuthCheck, CLI, Capistrano, Config, Demo, EventFormatter, Extension, GarbageCollectionProfiler, Hooks, JSExceptionTransaction, Marker, Minutely, StreamWrapper, Transaction, Transmitter

Constant Summary collapse

VERSION =
"2.3.0".freeze

Class Attribute Summary collapse

Class Method Summary collapse

Class Attribute Details

.configConfig?

Accessor for the AppSignal configuration. Return the current AppSignal configuration.

Can return nil if no configuration has been set or automatically loaded by an automatic integration or by calling start.

Examples:

Appsignal.config

Setting the configuration

Appsignal.config = Appsignal::Config.new(Dir.pwd, "production")

Returns:

See Also:



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# File 'lib/appsignal.rb', line 27

def config
  @config
end

.extension_loadedBoolean?

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Accessor for toggle if the AppSignal C-extension is loaded.

Can be nil if extension has not been loaded yet. See extension_loaded? for a boolean return value.

Returns:

  • (Boolean, nil)

See Also:



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# File 'lib/appsignal.rb', line 37

def extension_loaded
  @extension_loaded
end

.loggerLogger

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Note:

some classes may have options to set custom loggers. Their defaults are pointed to this attribute.

Accessor for the AppSignal logger.

If no logger has been set, it will return a "in memory logger", using in_memory_log. Once AppSignal is started (using start) the contents of the "in memory logger" is written to the new logger.

Returns:

  • (Logger)

See Also:



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# File 'lib/appsignal.rb', line 50

attr_writer :logger

Class Method Details

.active?Boolean

Returns the active state of the AppSignal integration.

Conditions apply for AppSignal to be marked as active:

This logic is used within instrument helper such as instrument so it's not necessary to wrap instrument calls with this method.

Examples:

Do this

Appsignal.instrument(..) do
  # Do this
end

Don't do this

if Appsignal.active?
  Appsignal.instrument(..) do
    # Don't do this
  end
end

Returns:

  • (Boolean)

Since:

  • 0.2.7



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# File 'lib/appsignal.rb', line 646

def active?
  config && config.active? && extension_loaded?
end

.add_distribution_value(key, value) ⇒ Object



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# File 'lib/appsignal.rb', line 544

def add_distribution_value(key, value)
  Appsignal::Extension.add_distribution_value(key.to_s, value.to_f)
rescue RangeError
  Appsignal.logger.warn("Distribution value #{value} for key '#{key}' is too big")
end

.extension_loaded?Boolean

Returns if the C-extension was loaded properly.

Returns:

  • (Boolean)

See Also:

Since:

  • 1.0.0



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# File 'lib/appsignal.rb', line 617

def extension_loaded?
  !!@extension_loaded
end

.extensionsObject

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.



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# File 'lib/appsignal.rb', line 53

def extensions
  @extensions ||= []
end

.forkedObject



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# File 'lib/appsignal.rb', line 163

def forked
  return unless active?
  Appsignal.start_logger
  logger.debug("Forked process, resubscribing and restarting extension")
  Appsignal::Extension.start
end

.get_server_state(key) ⇒ Object



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# File 'lib/appsignal.rb', line 170

def get_server_state(key)
  Appsignal::Extension.get_server_state(key)
end

.in_memory_logStringIO

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

In memory logger used before any logger is started with start_logger.

The contents of this logger are flushed to the logger in start_logger.

Returns:

  • (StringIO)


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# File 'lib/appsignal.rb', line 556

def in_memory_log
  if defined?(@in_memory_log) && @in_memory_log
    @in_memory_log
  else
    @in_memory_log = StringIO.new
  end
end

.increment_counter(key, value = 1) ⇒ Object



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# File 'lib/appsignal.rb', line 538

def increment_counter(key, value = 1)
  Appsignal::Extension.increment_counter(key.to_s, value)
rescue RangeError
  Appsignal.logger.warn("Counter value #{value} for key '#{key}' is too big")
end

.initialize_extensionsObject

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.



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# File 'lib/appsignal.rb', line 58

def initialize_extensions
  Appsignal.logger.debug("Initializing extensions")
  extensions.each do |extension|
    Appsignal.logger.debug("Initializing #{extension}")
    extension.initializer
  end
end

.instrument(name, title = nil, body = nil, body_format = Appsignal::EventFormatter::DEFAULT) { ... } ⇒ Object

Instrument helper for AppSignal.

For more help, read our custom instrumentation guide, listed under "See also".

Examples:

Simple instrumentation

Appsignal.instrument("fetch.issue_fetcher") do
  # To be instrumented code
end

Instrumentation with title and body

Appsignal.instrument(
  "fetch.issue_fetcher",
  "Fetching issue",
  "GitHub API"
) do
  # To be instrumented code
end

Parameters:

Yields:

  • yields the given block of code instrumented in an AppSignal event.

Returns:

  • (Object)

    Returns the blocks return value.

See Also:

Since:

  • 1.3.0



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# File 'lib/appsignal.rb', line 482

def instrument(name, title = nil, body = nil, body_format = Appsignal::EventFormatter::DEFAULT)
  Appsignal::Transaction.current.start_event
  yield if block_given?
ensure
  Appsignal::Transaction.current.finish_event(name, title, body, body_format)
end

.instrument_sql(name, title = nil, body = nil) { ... } ⇒ Object

Instrumentation helper for SQL queries.

This helper filters out values from SQL queries so you don't have to.

Examples:

SQL query instrumentation

Appsignal.instrument_sql("perform.query", nil, "SELECT * FROM ...") do
  # To be instrumented code
end

SQL query instrumentation

Appsignal.instrument_sql("perform.query", nil, "WHERE email = 'foo@..'") do
  # query value will replace 'foo..' with a question mark `?`.
end

Parameters:

  • name (String)

    Name of the instrumented event. Read our event naming guide listed under "See also".

  • title (String, nil) (defaults to: nil)

    Human readable name of the event.

  • body (String, nil) (defaults to: nil)

    SQL query that's being executed.

Yields:

  • yields the given block of code instrumented in an AppSignal event.

Returns:

  • (Object)

    Returns the blocks return value.

See Also:

Since:

  • 2.0.0



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# File 'lib/appsignal.rb', line 516

def instrument_sql(name, title = nil, body = nil, &block)
  instrument(name, title, body, Appsignal::EventFormatter::SQL_BODY_FORMAT, &block)
end

.is_ignored_action?(action) ⇒ Boolean

Deprecated.

No replacement

Returns:

  • (Boolean)


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# File 'lib/appsignal.rb', line 658

def is_ignored_action?(action) # rubocop:disable Style/PredicateName
  Appsignal.config[:ignore_actions].include?(action)
end

.is_ignored_error?(error) ⇒ Boolean Also known as: is_ignored_exception?

Deprecated.

No replacement

Returns:

  • (Boolean)


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# File 'lib/appsignal.rb', line 651

def is_ignored_error?(error) # rubocop:disable Style/PredicateName
  Appsignal.config[:ignore_errors].include?(error.class.name)
end

.listen_for_errorObject Also known as: listen_for_exception



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# File 'lib/appsignal.rb', line 220

def listen_for_error
  yield
rescue => error
  send_error(error)
  raise error
end

.log_formatter(prefix = nil) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.



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# File 'lib/appsignal.rb', line 572

def log_formatter(prefix = nil)
  pre = "#{prefix}: " if prefix
  proc do |severity, datetime, _progname, msg|
    "[#{datetime.strftime("%Y-%m-%dT%H:%M:%S")} (process) "\
      "##{Process.pid}][#{severity}] #{pre}#{msg}\n"
  end
end

.monitor_single_transaction(name, env = {}, &block) ⇒ Object

Monitor a transaction, stop AppSignal and wait for this single transaction to be flushed.

Useful for cases such as Rake tasks and Resque-like systems where a process is forked and immediately exits after the transaction finishes.



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# File 'lib/appsignal.rb', line 214

def monitor_single_transaction(name, env = {}, &block)
  monitor_transaction(name, env, &block)
ensure
  stop("monitor_single_transaction")
end

.monitor_transaction(name, env = {}) ⇒ Object

Wrap a transaction with AppSignal monitoring.



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# File 'lib/appsignal.rb', line 175

def monitor_transaction(name, env = {})
  unless active?
    return yield
  end

  if name.start_with?("perform_job".freeze)
    namespace = Appsignal::Transaction::BACKGROUND_JOB
    request   = Appsignal::Transaction::GenericRequest.new(env)
  elsif name.start_with?("process_action".freeze)
    namespace = Appsignal::Transaction::HTTP_REQUEST
    request   = ::Rack::Request.new(env)
  else
    logger.error("Unrecognized name '#{name}'")
    return
  end
  transaction = Appsignal::Transaction.create(
    SecureRandom.uuid,
    namespace,
    request
  )
  begin
    Appsignal.instrument(name) do
      yield
    end
  rescue => error
    transaction.set_error(error)
    raise error
  ensure
    transaction.set_http_or_background_action(request.env)
    transaction.set_http_or_background_queue_start
    Appsignal::Transaction.complete_current!
  end
end

.send_error(error, tags = nil, namespace = Appsignal::Transaction::HTTP_REQUEST) ⇒ void Also known as: send_exception

This method returns an undefined value.

Send an error to AppSignal regardless of the context.

Records and send the exception to AppSignal.

This instrumentation helper does not require a transaction to be active, it starts a new transaction by itself.

Use set_error if your want to add an exception to the current transaction.

Note: Does not do anything if AppSignal is not active or when the "error" is not a class extended from Ruby's Exception class.

Examples:

Send an exception

begin
  raise "oh no!"
rescue => e
  Appsignal.send_error(e)
end

Send an exception with tags

begin
  raise "oh no!"
rescue => e
  Appsignal.send_error(e, :key => "value")
end

Parameters:

  • error (Exception)

    The error to send to AppSignal.

  • tags (Hash{String, Symbol => String, Symbol, Integer}) (defaults to: nil)

    Additional tags to add to the error. See also tag_request.

  • namespace (String) (defaults to: Appsignal::Transaction::HTTP_REQUEST)

    The namespace in which the error occurred. See also set_namespace.

See Also:

Since:

  • 0.6.0



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# File 'lib/appsignal.rb', line 267

def send_error(error, tags = nil, namespace = Appsignal::Transaction::HTTP_REQUEST)
  return unless active?
  unless error.is_a?(Exception)
    logger.error("Can't send error, given value is not an exception")
    return
  end
  transaction = Appsignal::Transaction.new(
    SecureRandom.uuid,
    namespace,
    Appsignal::Transaction::GenericRequest.new({})
  )
  transaction.set_tags(tags) if tags
  transaction.set_error(error)
  transaction.complete
end

.set_action(action) ⇒ void

This method returns an undefined value.

Set a custom action name for the current transaction.

When using an integration such as the Rails or Sinatra AppSignal will try to find the action name from the controller or endpoint for you.

If you want to customize the action name as it appears on AppSignal.com you can use this method. This overrides the action name AppSignal generates in an integration.

Examples:

in a Rails controller

class SomeController < ApplicationController
  before_action :set_appsignal_action

  def set_appsignal_action
    Appsignal.set_action("DynamicController#dynamic_method")
  end
end

Parameters:

  • action (String)

See Also:

Since:

  • 2.2.0



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# File 'lib/appsignal.rb', line 356

def set_action(action)
  return if !active? ||
      Appsignal::Transaction.current.nil? ||
      action.nil?
  Appsignal::Transaction.current.set_action(action)
end

.set_error(exception, tags = nil, namespace = nil) ⇒ void Also known as: set_exception, add_exception

This method returns an undefined value.

Set an error on the current transaction.

Note: Does not do anything if AppSignal is not active, no transaction is currently active or when the "error" is not a class extended from Ruby's Exception class.

Examples:

Manual instrumentation of set_error.

# Manually starting AppSignal here
# Manually starting a transaction here.
begin
  raise "oh no!"
rescue => e
  Appsignal.set_error(error)
end
# Manually completing the transaction here.
# Manually stopping AppSignal here

In a Rails application

class SomeController < ApplicationController
  # The AppSignal transaction is created by our integration for you.
  def create
    # Do something that breaks
  rescue => e
    Appsignal.set_error(e)
  end
end

Parameters:

  • exception (Exception)

    The error to add to the current transaction.

  • tags (Hash{String, Symbol => String, Symbol, Integer}) (defaults to: nil)

    Additional tags to add to the error. See also tag_request.

  • namespace (String) (defaults to: nil)

    The namespace in which the error occurred. See also set_namespace.

See Also:

Since:

  • 0.6.6



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# File 'lib/appsignal.rb', line 322

def set_error(exception, tags = nil, namespace = nil)
  return if !active? ||
      Appsignal::Transaction.current.nil? ||
      exception.nil?
  transaction = Appsignal::Transaction.current
  transaction.set_error(exception)
  transaction.set_tags(tags) if tags
  transaction.set_namespace(namespace) if namespace
end

.set_gauge(key, value) ⇒ Object



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# File 'lib/appsignal.rb', line 520

def set_gauge(key, value)
  Appsignal::Extension.set_gauge(key.to_s, value.to_f)
rescue RangeError
  Appsignal.logger.warn("Gauge value #{value} for key '#{key}' is too big")
end

.set_host_gauge(key, value) ⇒ Object



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# File 'lib/appsignal.rb', line 526

def set_host_gauge(key, value)
  Appsignal::Extension.set_host_gauge(key.to_s, value.to_f)
rescue RangeError
  Appsignal.logger.warn("Host gauge value #{value} for key '#{key}' is too big")
end

.set_namespace(namespace) ⇒ void

This method returns an undefined value.

Set a custom namespace for the current transaction.

When using an integration such as Rails or Sidekiq AppSignal will try to find a appropriate namespace for the transaction.

A Rails controller will be automatically put in the "http_request" namespace, while a Sidekiq background job is put in the "background_job" namespace.

Note: The "http_request" namespace gets transformed on AppSignal.com to "Web" and "background_job" gets transformed to "Background".

If you want to customize the namespace in which transactions appear you can use this method. This overrides the namespace AppSignal uses by default.

A common request we've seen is to split the administration panel from the main application.

Examples:

create a custom admin namespace

class AdminController < ApplicationController
  before_action :set_appsignal_namespace

  def set_appsignal_namespace
    Appsignal.set_namespace("admin")
  end
end

Parameters:

  • namespace (String)

See Also:

Since:

  • 2.2.0



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# File 'lib/appsignal.rb', line 395

def set_namespace(namespace)
  return if !active? ||
      Appsignal::Transaction.current.nil? ||
      namespace.nil?
  Appsignal::Transaction.current.set_namespace(namespace)
end

.set_process_gauge(key, value) ⇒ Object



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# File 'lib/appsignal.rb', line 532

def set_process_gauge(key, value)
  Appsignal::Extension.set_process_gauge(key.to_s, value.to_f)
rescue RangeError
  Appsignal.logger.warn("Process gauge value #{value} for key '#{key}' is too big")
end

.startvoid

This method returns an undefined value.

Start the AppSignal integration.

Starts AppSignal with the given configuration. If no configuration is set yet it will try to automatically load the configuration using the environment loaded from environment variables and the currently working directory.

This is not required for the automatic integrations AppSignal offers, but this is required for all non-automatic integrations and pure Ruby applications. For more information, see our integrations list and our Integrating AppSignal guide.

To start the logger see start_logger.

Examples:

Appsignal.start

with custom loaded configuration

Appsignal.config = Appsignal::Config.new(Dir.pwd, "production")
Appsignal.start

Since:

  • 0.7.0



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# File 'lib/appsignal.rb', line 91

def start
  unless extension_loaded?
    logger.info("Not starting appsignal, extension is not loaded")
    return
  end

  logger.debug("Starting appsignal")

  unless @config
    @config = Config.new(
      Dir.pwd,
      ENV["APPSIGNAL_APP_ENV"] || ENV["RAILS_ENV"] || ENV["RACK_ENV"]
    )
  end

  if config.valid?
    logger.level =
      if config[:debug]
        Logger::DEBUG
      else
        Logger::INFO
      end
    if config.active?
      logger.info "Starting AppSignal #{Appsignal::VERSION} "\
        "(#{$PROGRAM_NAME}, Ruby #{RUBY_VERSION}, #{RUBY_PLATFORM})"
      config.write_to_environment
      Appsignal::Extension.start
      Appsignal::Hooks.load_hooks
      Appsignal::EventFormatter.initialize_formatters
      initialize_extensions

      if config[:enable_allocation_tracking]
        Appsignal::Extension.install_allocation_event_hook
      end

      if config[:enable_gc_instrumentation]
        GC::Profiler.enable
        Appsignal::Minutely.add_gc_probe
      end

      Appsignal::Minutely.start if config[:enable_minutely_probes]
    else
      logger.info("Not starting, not active for #{config.env}")
    end
  else
    logger.error("Not starting, no valid config for this environment")
  end
end

.start_logger(path_arg = nil) ⇒ void

This method returns an undefined value.

Start the AppSignal logger.

Sets the log level and sets the logger. Uses a file-based logger or the STDOUT-based logger. See the :log configuration option.

Parameters:

  • path_arg (nil) (defaults to: nil)

    Deprecated param. Use the :log_path configuration option instead.

Since:

  • 0.7.0



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# File 'lib/appsignal.rb', line 589

def start_logger(path_arg = nil)
  if config && config[:log] == "file" && config.log_file_path
    start_file_logger(config.log_file_path)
  else
    start_stdout_logger
  end

  logger.level =
    if config && config[:debug]
      Logger::DEBUG
    else
      Logger::INFO
    end

  if in_memory_log
    logger << in_memory_log.string
  end

  if path_arg
    logger.info("Setting the path in start_logger has no effect anymore, set it in the config instead")
  end
end

.stop(called_by = nil) ⇒ void

This method returns an undefined value.

Stop AppSignal's agent.

Stops the AppSignal agent. Call this before the end of your program to make sure the agent is stopped as well.

Examples:

Appsignal.start
# Run your application
Appsignal.stop

Parameters:

  • called_by (String) (defaults to: nil)

    Name of the thing that requested the agent to be stopped. Will be used in the AppSignal log file.

Since:

  • 1.0.0



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# File 'lib/appsignal.rb', line 154

def stop(called_by = nil)
  if called_by
    logger.debug("Stopping appsignal (#{called_by})")
  else
    logger.debug("Stopping appsignal")
  end
  Appsignal::Extension.stop
end

.tag_request(tags = {}) ⇒ void Also known as: tag_job

This method returns an undefined value.

Set tags on the current transaction.

Tags are extra bits of information that are added to transaction and appear on sample details pages on AppSignal.com.

Examples:

Appsignal.tag_request(:locale => "en")
Appsignal.tag_request("locale" => "en")
Appsignal.tag_request("user_id" => 1)

Nested hashes are not supported

# Bad
Appsignal.tag_request(:user => { :locale => "en" })

in a Rails controller

class SomeController < ApplicationController
  before_action :set_appsignal_tags

  def set_appsignal_tags
    Appsignal.tag_request(:locale => I18n.locale)
  end
end

Parameters:

  • tags (Hash) (defaults to: {})

    Collection of tags.

Options Hash (tags):

  • :any (String, Symbol, Integer)

    The name of the tag as a Symbol.

  • "any" (String, Symbol, Integer)

    The name of the tag as a String.

See Also:



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# File 'lib/appsignal.rb', line 435

def tag_request(tags = {})
  return unless active?
  transaction = Appsignal::Transaction.current
  return false unless transaction
  transaction.set_tags(tags)
end

.without_instrumentation { ... } ⇒ Object

Convenience method for skipping instrumentations around a block of code.

Examples:

Appsignal.without_instrumentation do
  # Complex code here
end

Yields:

  • block of code that shouldn't be instrumented.

Returns:

  • (Object)

    Returns the return value of the block.

Since:

  • 0.8.7



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# File 'lib/appsignal.rb', line 673

def without_instrumentation
  Appsignal::Transaction.current.pause! if Appsignal::Transaction.current
  yield
ensure
  Appsignal::Transaction.current.resume! if Appsignal::Transaction.current
end