doc: add minutes for meeting Aug 25

Fixes: nodejs#494

wg-meetings/2021-08-25.md

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+# Node.js  Diagnostics WorkGroup Meeting 2021-08-25
+
+## Links
+
+* **Recording**:  https://www.youtube.com/watch?v=UsGZ3EsDAnk
+* **GitHub Issue**: https://github.com/nodejs/diagnostics/issues/494
+* **Minutes Google Doc**: https://docs.google.com/document/d/1OevFMG4iAcQG_kbBDkCvVX7SgRv4iVfbgYtce3AfSV8/edit
+
+## Present
+
+* Diagnostics team: @nodejs/diagnostics
+
+* Gireesh Punathil (@gireeshpunathil)
+* Rafael Gonzaga (@rafaelgss)
+* Helio Frota (@helio-frota)
+* Bradley Farias (@bmeck)
+* Stephen Belanger (@Qard)
+
+
+
+## Agenda
+
+## Announcements
+
+*Extracted from **diag-agenda** labelled issues and pull requests from the **nodejs org** prior to the meeting.
+
+### nodejs/node
+
+* async_hooks: multi-tenant promise hook api [#39283](https://github.com/nodejs/node/pull/39283)
+
+  * still waiting for feedback, there is no agreement on the shape of the API. Hoping to get more reviews on the PR
+  * needs consensus on the API placement - should it be a top level module, or can be shipped under async_hooks?
+  * also we need to decide on the name of the module without conflicting with npm libraries
+
+ * Helio brought-in a new topic:
+   * Helio: How to track execution of synchronous functions
+   * Is it worth making some tools to identify synchronous and asynchronous?
+   * Rafael: we can only measure the event loop, node clinic might be doing it, other tools like zeroX, etc.
+   * Rafael: without native addons, this capability is mostly not possible.
+   * Gireesh: probably worth opening an issue to discuss this further.
+   * https://github.com/nodejs/diagnostics/issues/495 is opened to take this forward
+
+### nodejs/diagnostics
+
+* docs(linux-perf): add tutorial of linux_perf [#493](https://github.com/nodejs/diagnostics/pull/493)
+  * good to land, had sufficient reviews
+* feat: add debugging blackbox section [#490](https://github.com/nodejs/diagnostics/pull/490)
+  * good to land, had sufficient reviews
+* Identify async_hooks use cases beyond AsyncLocalStorage [#437](https://github.com/nodejs/diagnostics/issues/437)
+  * still can have more feedback, the related issue is active with discussions.
+
+## Q&A, Other
+
+## Upcoming Meetings
+
+* **Node.js Foundation Calendar**: <https://nodejs.org/calendar>
+
+Click `+GoogleCalendar` at the bottom right to add to your own Google calendar.