This document describes the changes made to the Event Tracer (ET) system from version to version. The intention of this document is to list all incompatibilities as well as all enhancements and bugfixes for every release of Event Tracer (ET). Each release of Event Tracer (ET) thus constitutes one section in this document. The title of each section is the version number of Event Tracer (ET).

## ET 1.6.5

### Improvements and New Features

Fixed warnings in code matching on underscore prefixed variables.

Own Id: OTP-17385 Aux Id: OTP-17123

## ET 1.6.4

### Fixed Bugs and Malfunctions

The scroll bar of the et_viewer window could not be dragged all the way to the top of the window. It would always stop at the second event. This is now corrected.

Own Id: OTP-15463 Aux Id: ERL-780

## ET 1.6.3

### Fixed Bugs and Malfunctions

Improved documentation.

Own Id: OTP-15190

## ET 1.6.2

### Improvements and New Features

Calls to erlang:get_stacktrace() are removed.

Own Id: OTP-14861

## ET 1.6.1

### Improvements and New Features

Tools are updated to show Unicode atoms correctly.

Own Id: OTP-14464

## ET 1.6

### Improvements and New Features

Update selector to utilize new garbage collection trace tags.

Own Id: OTP-13545

## ET 1.5.1

### Fixed Bugs and Malfunctions

The et application must continue to use erlang:now/0 in order to obtain timestamps that are consistent with timestamps obtained from tracing. The application has been updated to suppress the warning for erlang:now/0.

Own Id: OTP-12780

## ET 1.5

### Fixed Bugs and Malfunctions

Application upgrade (appup) files are corrected for the following applications:

asn1, common_test, compiler, crypto, debugger, dialyzer, edoc, eldap, erl_docgen, et, eunit, gs, hipe, inets, observer, odbc, os_mon, otp_mibs, parsetools, percept, public_key, reltool, runtime_tools, ssh, syntax_tools, test_server, tools, typer, webtool, wx, xmerl

A new test utility for testing appup files is added to test_server. This is now used by most applications in OTP.

(Thanks to Tobias Schlager)

Own Id: OTP-11744

### Improvements and New Features

Removed gs based applications and gs based backends. The observer application replaces the removed applications.

*** POTENTIAL INCOMPATIBILITY ***

Own Id: OTP-10915

## ET 1.4.4.5

### Improvements and New Features

The encoding of the notes.xml file has been changed from latin1 to utf-8 to avoid future merge problems.

Own Id: OTP-11310

## ET 1.4.4.4

### Improvements and New Features

Use erlang:demonitor(Ref, [flush]) where applicable. Thanks to Loïc Hoguin.

Own Id: OTP-11039

Rename and document lists:zf/2 as lists:filtermap/2. Thanks to Anthony Ramine.

Own Id: OTP-11078

## ET 1.4.4.3

### Improvements and New Features

Where necessary a comment stating encoding has been added to Erlang files. The comment is meant to be removed in Erlang/OTP R17B when UTF-8 becomes the default encoding.

Own Id: OTP-10630

## ET 1.4.4.2

### Fixed Bugs and Malfunctions

Fix typo in ET doc (Thanks to Ricardo Catalinas Jiménez)

Own Id: OTP-10119

## ET 1.4.4.1

### Improvements and New Features

The GS applications is now deprecated and will be removed in the R16 release. The following GS-based applications have been superseded by the Observer application and will removed in R16: Appmon, Pman, Tv.

*** POTENTIAL INCOMPATIBILITY ***

Own Id: OTP-9907

## ET 1.4.4

### Fixed Bugs and Malfunctions

Dialyzer warnings have been fixed.

Own Id: OTP-9470

## ET 1.4.3

### Fixed Bugs and Malfunctions

The popup window 'contents viewer' did not display properly on Windows.

Own Id: OTP-9238

## ET 1.4.2

### Fixed Bugs and Malfunctions

Fix error when module et was used in et_selector trace patterns.

Own Id: OTP-8904

## ET 1.4.1

### Fixed Bugs and Malfunctions

Fixed broken links in the documentation.

Own Id: OTP-8796

### Improvements and New Features

Fixed gui crash on windows.

Own Id: OTP-8830

## ET 1.4

### Improvements and New Features

Thanks to Olle Mattsson the GUI parts are rewritten to use wxWidgets. For the time being it is still possible to use the old GS based version of the tool, but it is deprecated. The wxWidgets based version is started by default.

A print function has been added, in order to enable printing of sequence charts.

A new tutorial has been added to the documentation. It is based on Jayson Vantuyl's article http://souja.net/2009/04/making-sense-of-erlangs-event-tracer.html.

The functions et:trace_me/4 and et:trace_me/5 has been introduced in order to replace the deprecated functions et:report_event/4 and et:report_event/5. Hopefully the new names makes it a little more obvious what the intended usage of the functions are.

The max_events configuration parameter to et_viewer is not used any more. Now the event cache in the Viewer only contains those events that actually are displayed in the GUI.

Own Id: OTP-8058

## ET 1.3.3

### Improvements and New Features

The documentation is now built with open source tools (xsltproc and fop) that exists on most platforms. One visible change is that the HTML frames are removed.

Own Id: OTP-8201

## ET 1.3.2

### Improvements and New Features

The start module in the app file has been corrected.

Own Id: OTP-8078

## ET 1.3.1

### Improvements and New Features

Changed copyright

Own Id: OTP-7830

## ET 1.3

### Improvements and New Features

Adjusted copyright

Own Id: OTP-6985

## ET 1.0.1

### Improvements and New Features

Document source changed from SGML to XML.

Own Id: OTP-6774

## ET 1.0.0.1

### Improvements and New Features

Minor Makefile changes.

Own Id: OTP-6689

## Event Tracer (ET) 1.0

### Improvements and new features

This is the first release of the Event Tracer (ET) as a stand-alone application separated from the Megaco application.