`Dart: Open Observatory` not opening in VS Code for Flutter

Question

I want to observe the memory consumption of my Flutter Desktop app.

I noticed that the older version of the Dart Devtools has this Observatory homepage: I took this from YouTube - Flutter performance videos 1-3 years ago.

The problem is, when I search for Dart: Open Observatory in the VSCode, it doesn't open or do anything:

When I run flutter run -d macos, both URLs below:

A Dart VM Service on macOS is available at: <URL>
The Flutter DevTools debugger and profiler on macOS is available at: <URL>

it opens to Performance tab by default:

And in the Memory tab:

Currently, it doesn't have these 2 anymore:

1. current memory
2. peak memory

Is this not available in the latest Dart Devtools anymore? Where can I find the current memory and peak memory?

Answer 1

The maintainers of the flutter devtools discussed this in issue ticket https://github.com/flutter/devtools/issues/6159. According to Kenzie Davisson, "the observatory has been deprecated in favor of Dart DevTools.". Danny Tuppeny replied that the Dart: Open Observatory command is "still possible to use [...] if you have an older SDK or have configured --serve-observatory in your toolArgs so it might be useful to have. Once we have an SDK version that removes --serve-observatory we could use that version number to hide it from new SDKs that definitely don't support it (and in the meantime we could add "(Deprecated)" to the end)", then later: "I've opened Dart-Code/Dart-Code#4697 about marking it deprecated and Dart-Code/Dart-Code#4696 about hiding it once we have an SDK version that does not include it."