Amanda Tarafa Mas

Closing, there was a known issue with these long running operaitons, the fix has been rolling out for the past week, hence the flakiness. Roll out should have now completed...

Reopening as this has happened again twice in #1846. I've checked the code and so has @mkoshurnikov , it does look OK, we are both pretty certain that the tests...

This has happened again today, reopening: - https://source.cloud.google.com/results/invocations/2a5ccd52-3476-4404-bc6a-56eab3dff362/log - https://source.cloud.google.com/results/invocations/0e469764-3d17-4512-92cc-439e667ec655/log

And again: https://source.cloud.google.com/results/invocations/c248e0be-7607-4e4a-973c-6dea2ff388db/log

CI seems fine. I'll reopen if it happens again. Thanks.

Slightly different failures [here](https://source.cloud.google.com/results/invocations/ed1f2aab-5cc7-4762-9cc8-c47f44139bf4/targets/github%2Fdotnet-docs-samples%2Fdatastore%2Fapi%2FTaskListTest%2FTestResults/tests;group=GoogleCloudSamples.DatastoreTest;test=GoogleCloudSamples.DatastoreTest.TestLimit;row=1).

Another [instance](https://source.cloud.google.com/results/invocations/352c9efe-ca0f-4176-aac5-a130183f03c8/targets/github%2Fdotnet-docs-samples%2Fdatastore%2Fapi%2FTaskListTest%2FTestResults/tests) of this.

[Again](https://source.cloud.google.com/results/invocations/af36fccf-6548-4689-a253-9737b7a5e320/targets/github%2Fdotnet-docs-samples%2Fdatastore%2Fapi%2FTaskListTest%2FTestResults/tests)

And [FirestoreTests.GoogleCloudSamples.FirestoreTests.ListenForChangesTest](https://fusion2.corp.google.com/invocations/7929d1e8-9d69-42d7-868c-3f07c73d53b4/targets) (Firestore tests could do with a rewrite)

We are currently supporting .NET Core App 2.1, 2.2 and 3.1. Moving forward we'll only support 2.1 andd 3.1 which are the ones wich MS will keep support for in...