workspaces/dataSources fail to deploy inconsistently.

Hello,
I don't have a problem with a specific template, but just don't know where else to ask for advice.
I'm having trouble deploying some Windows and Linux "Microsoft.OperationalInsights/workspaces/dataSources".

I made a template to deploy them and all looked to have deployed successfully. No errors or anything.
.. but when I looked into it - several were just missing.
I made a small script to deploy, query and delete the datasources in a loop.. and below are the results. The inconsistency with which they are "failing" is troublesome.
If there was something wrong with the template.. it should have failed.
If I wrote a nonsense it should have been failing the same way every time.... but I don't see neither of that.

Number of data source per type expected values:
>> AzureActivityLog:0
>> CustomLog:0
>> LinuxPerformanceObject:2
>> LinuxSyslog:1
>> WindowsEvent:4
>> WindowsPerformanceCounter:18

Reality:

_________________________________________

Loop counter: 1

26 April 2019 13:58:20

#### DataSources ####

>> AzureActivityLog:0

>> CustomLog:0

>> LinuxPerformanceObject:1

LinuxPerf1

>> LinuxSyslog:1

Syslog1

>> WindowsEvent:2

WindowsEvent0,WindowsEvent1

>> WindowsPerformanceCounter:18

WindowsPerfCounter0,WindowsPerfCounter1,WindowsPerfCounter10,WindowsPerfCounter11,WindowsPerfCounter12,WindowsPerfCounter13,WindowsPerfCounter14,WindowsPerfCounter15,WindowsPerfCounter16,WindowsPerfCounter17,WindowsPerfCounter2,WindowsPerfCounter3,WindowsPerfCounter4,WindowsPerfCounter5,WindowsPerfCounter6,WindowsPerfCounter7,WindowsPerfCounter8,WindowsPerfCounter9

_________________________________________

Loop counter: 2

26 April 2019 14:01:34

#### DataSources ####

>> AzureActivityLog:0

>> CustomLog:0

>> LinuxPerformanceObject:2

LinuxPerf1,LinuxPerf2

>> LinuxSyslog:1

Syslog1

>> WindowsEvent:2

WindowsEvent0,WindowsEvent1

>> WindowsPerformanceCounter:18

WindowsPerfCounter0,WindowsPerfCounter1,WindowsPerfCounter10,WindowsPerfCounter11,WindowsPerfCounter12,WindowsPerfCounter13,WindowsPerfCounter14,WindowsPerfCounter15,WindowsPerfCounter16,WindowsPerfCounter17,WindowsPerfCounter2,WindowsPerfCounter3,WindowsPerfCounter4,WindowsPerfCounter5,WindowsPerfCounter6,WindowsPerfCounter7,WindowsPerfCounter8,WindowsPerfCounter9

_________________________________________

Loop counter: 3

26 April 2019 14:04:36

#### DataSources ####

>> AzureActivityLog:0

>> CustomLog:0

>> LinuxPerformanceObject:1

LinuxPerf1

>> LinuxSyslog:0

>> WindowsEvent:2

WindowsEvent0,WindowsEvent1

>> WindowsPerformanceCounter:18

WindowsPerfCounter0,WindowsPerfCounter1,WindowsPerfCounter10,WindowsPerfCounter11,WindowsPerfCounter12,WindowsPerfCounter13,WindowsPerfCounter14,WindowsPerfCounter15,WindowsPerfCounter16,WindowsPerfCounter17,WindowsPerfCounter2,WindowsPerfCounter3,WindowsPerfCounter4,WindowsPerfCounter5,WindowsPerfCounter6,WindowsPerfCounter7,WindowsPerfCounter8,WindowsPerfCounter9

_________________________________________

Loop counter: 4

26 April 2019 14:08:26

#### DataSources ####

>> AzureActivityLog:0

>> CustomLog:0

>> LinuxPerformanceObject:1

LinuxPerf2

>> LinuxSyslog:1

Syslog1

>> WindowsEvent:2

WindowsEvent0,WindowsEvent1

>> WindowsPerformanceCounter:18

WindowsPerfCounter0,WindowsPerfCounter1,WindowsPerfCounter10,WindowsPerfCounter11,WindowsPerfCounter12,WindowsPerfCounter13,WindowsPerfCounter14,WindowsPerfCounter15,WindowsPerfCounter16,WindowsPerfCounter17,WindowsPerfCounter2,WindowsPerfCounter3,WindowsPerfCounter4,WindowsPerfCounter5,WindowsPerfCounter6,WindowsPerfCounter7,WindowsPerfCounter8,WindowsPerfCounter9

_________________________________________

Loop counter: 5

26 April 2019 14:12:08

#### DataSources ####

>> AzureActivityLog:0

>> CustomLog:0

>> LinuxPerformanceObject:2

LinuxPerf1,LinuxPerf2

>> LinuxSyslog:1

Syslog1

>> WindowsEvent:2

WindowsEvent0,WindowsEvent1

>> WindowsPerformanceCounter:18

WindowsPerfCounter0,WindowsPerfCounter1,WindowsPerfCounter10,WindowsPerfCounter11,WindowsPerfCounter12,WindowsPerfCounter13,WindowsPerfCounter14,WindowsPerfCounter15,WindowsPerfCounter16,WindowsPerfCounter17,WindowsPerfCounter2,WindowsPerfCounter3,WindowsPerfCounter4,WindowsPerfCounter5,WindowsPerfCounter6,WindowsPerfCounter7,WindowsPerfCounter8,WindowsPerfCounter9

Start with the deployment template and the loop-based deploy, query, and delete script described in the report. Reproduce the inconsistent Microsoft.OperationalInsights/workspaces/dataSources results and compare each requested type with the queried resources. The issue is done when the cause is identified and deployments reliably produce all expected data sources.

Written by the indexing model from the issue text.