doc: add minutes for meeting 3 April 2019 (#291)

PR-URL: #291

wg-meetings/2019-04-03.md

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+# Node.js Foundation Diagnostics WorkGroup Meeting 2019-04-03
+
+## Links
+
+* **Recording**: https://www.youtube.com/watch?v=JxNIUzmuyIw
+* **GitHub Issue**: https://github.com/nodejs/diagnostics/issues/287
+
+## Present
+
+* Michael Dawson (@mhdawson)
+* Thomas Watson (@watson)
+* Kelvin Jin (@kjin) 
+* Peter Marton (@hekike)
+
+## Agenda
+
+## Announcements
+
+*Extracted from **diag-agenda** labelled issues and pull requests from the **nodejs org** prior to the meeting.
+
+  * Thomas, merged doc with minutes from summit.  If you had slides please add to the
+    folder.
+  * Kelvin will have perfetto code for review by next meeting.  Should likely create fork under    
+    repo to start working on it.
+
+  * Peter, Netflix thinking about OpenCensus Client and are talking to Ali/Kelvin about getting
+    involved.  Have some suggested changes (making CLS usage optional and working on some 
+    child span creation API improvements).
+
+  * Michael interested as well in OpenCensus, Kelvin to set follow up meeting.
+
+### nodejs/node
+
+* Support pausing the debugger on script load [#24687](https://github.com/nodejs/node/issues/24687)
+  * Kelvin to follow up as it may be an orphan
+
+### nodejs/diagnostics
+
+* Post-mortem debugging support inside V8/Node.js [#227](https://github.com/nodejs/diagnostics/issues/227)\
+  * Michael take off agenda until there is something to discuss.
+* Diagnostics "Best Practices" Guide? [#211](https://github.com/nodejs/diagnostics/issues/211)
+  * Peter Marton - starting to work on draft for diagnostic memory leak, and other most
+    common use case
+    * will contain structure, and will try to share doc by the end of the week
+  * Michael also trying to sync up with Gireesh to start on concrete next steps as well. 
+
+* Diag WG Deep Dives - topics [#168](https://github.com/nodejs/diagnostics/issues/168)
+  * No new on this front/.
+
+* Expectation about tier of support from diagnostic tools and VMs [#157](https://github.com/nodejs/diagnostics/issues/157)
+  * To be driven by best practices.
+
+* \[async_hooks\] stable API - tracking issue [#124](https://github.com/nodejs/diagnostics/issues/124)
+  * Nothing new to report this week
+  * Need to update the issue based on discussion in the summit.  
+    * Focus on CLS instead so that stable API is less important
+    * Should we have CLS as strategic initiative, and find a Champion?
+      * Thomas will volunteer as champion.
+
+* Async-context formalization and diagnostics support [#107](https://github.com/nodejs/diagnostics/issues/107)
+  * Michael K was going to talk to Microsoft team about potential experimentation in v8
+  * No update this week.
+
+* \[trace_event\] tracking issue [#84](https://github.com/nodejs/diagnostics/issues/84)
+  * Michael did work with IBMer, who is going to look at starting to add more tracepoints.
+  * Kelvin will check with Perfetto team on what kind of options for enabling based on categories
+    or levels there is.
+
+## 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.
+
+