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# Event Tracer (ET) Release Notes

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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 1.7.2

### Improvements and New Features

- The license and copyright header has changed format to include an `SPDX-License-Identifier`. At the same time, most files have been updated to follow a uniform standard for license headers.

  Own Id: OTP-19575 Aux Id: PR-9670

## ET 1.7.1

### Fixed Bugs and Malfunctions

- The dependencies for this application are now listed in the app file.

  Own Id: OTP-18831 Aux Id: PR-7441

- Dialyzer warnings due to type specs added in `dbg` have been eliminated.

  Own Id: OTP-18860

### Improvements and New Features

- The documentation has been migrated to use Markdown and ExDoc.

  Own Id: OTP-18955 Aux Id: PR-8026

## ET 1.7

### Improvements and New Features

- Deprecates `dbg:stop_clear/0` because it is simply a function alias to `dbg:stop/0`

  Own Id: OTP-18478 Aux Id: GH-6903

## 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.

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