The attached patch adds some logic to track and periodically print out statistics in the control logic describing the total memory used by replaying processes in various categories and the time taken to scan sections of the recording in relation to when those sections were first added. There are also some minor improvements to the spew in the various replay JS components.

Depends on D34954

The priority flag is not set for this bug.
:bhackett, could you have a look please?

For more information, please visit auto_nag documentation.

Backed out 3 changesets (bug 1556847, bug 1556858, bug 1405402) for eslint failures at /actors/replay/debugger.js on a CLOSED TREE.

Backout link: https://hg.mozilla.org/integration/mozilla-inbound/rev/756e8d09a98ff8869a8065337e1f2d2f9816e126

Pushes with failures:
https://treeherder.mozilla.org/#/jobs?repo=mozilla-inbound&resultStatus=testfailed%2Cbusted%2Cexception&revision=1bf0b6a8dd1309ee22bd5b3593ca150172b644a9&selectedJob=257596995

https://treeherder.mozilla.org/#/jobs?repo=mozilla-inbound&resultStatus=testfailed%2Cbusted%2Cexception&revision=099de68d4716a2c7ba843c5cfcf053bd25fcf91c&selectedJob=257597102

https://treeherder.mozilla.org/#/jobs?repo=mozilla-inbound&resultStatus=testfailed%2Cbusted%2Cexception&revision=03df8624c36c9434ab73dcd8c118563310e81c85&selectedJob=257597123

Log link: https://treeherder.mozilla.org/logviewer.html#/jobs?job_id=257596995&repo=mozilla-inbound&lineNumber=290

Log snippet:
[task 2019-07-21T18:16:52.027Z] copying build/lib.linux-x86_64-2.7/psutil/_psutil_linux.so -> psutil
[task 2019-07-21T18:16:52.027Z] copying build/lib.linux-x86_64-2.7/psutil/_psutil_posix.so -> psutil
[task 2019-07-21T18:16:52.027Z]
[task 2019-07-21T18:16:52.027Z] Error processing command. Ignoring because optional. (optional:packages.txt:comm/build/virtualenv_packages.txt)
[task 2019-07-21T18:33:27.238Z] TEST-UNEXPECTED-ERROR | /builds/worker/checkouts/gecko/devtools/server/actors/replay/debugger.js:548:28 | Insert ??????? (prettier/prettier)
[task 2019-07-21T18:33:27.238Z] TEST-UNEXPECTED-ERROR | /builds/worker/checkouts/gecko/devtools/server/actors/replay/debugger.js:549:7 | Replace type:?"getSource", with ??type:?"getSource",???????? (prettier/prettier)
[task 2019-07-21T18:33:27.238Z] TEST-UNEXPECTED-ERROR | /builds/worker/checkouts/gecko/devtools/server/actors/replay/debugger.js:550:1 | Replace ????}) with ??????})????? (prettier/prettier)
[taskcluster 2019-07-21 18:33:27.578Z] === Task Finished ===
[taskcluster 2019-07-21 18:33:28.586Z] Unsuccessful task run with exit code: 1 completed in 1368.153 seconds

https://hg.mozilla.org/mozilla-central/rev/0e05f7b29c0c