Project telemetry data

[nelsonkopliku]

This PR adds a Projector for the required Telemetry information.

HostName
SLESVersion
CPUCount
SocketCount
TotalMemoryMB
CloudProvider

This works also as a PoC for projecting the Hosts as a replacement for Consul Catalog.

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Extra:

By adding a

_ "github.com/trento-project/trento/test"

we can consider the cwd for our tests being the project root, which allows to simplify path specification in tests and allows us to reuse mocks.

Example

NewDiscoveredCloudMock in agent/discovery/mocks/discovered_cloud_mock.go is used as a source for mocks in two different places

• agent/discovery/collector/publishing_test.go
• web/datapipeline/telemetry_projector_test.go

Without the trick it would't have been possible to reuse the same NewDiscoveredCloudMock because, in respect of the caller executor (publishing_test.go or telemetry_projector_test.go) it would have required to load the same file from a different relative location.

So,
calling NewDiscoveredCloudMock from agent/discovery/collector/publishing_test.go would require loading the fixture from ../../../test/fixtures/discovery/azure/azure_discovery.json

while calling NewDiscoveredCloudMock from web/datapipeline/telemetry_projector_test.go would require loading the fixture from ../../test/fixtures/discovery/azure/azure_discovery.json

Note the difference ../../../ vs ../../

with this trick we can consider the cwd as the root of the project so the path to be loaded would always be the same
./test/fixtures/discovery/azure/azure_discovery.json

Hope it makes sense.

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What's next:
For telemetry: spike with the team on opentelemetry/promscale/timescale
For consul migration: this opens doors for consul Host catalog replacement by projecting hosts and defining Heartbeat and healthcheck

[arbulu89]

Hey @nelsonkopliku ,
I have put a bunch of comments, but I'm just setting the PR to request changes for the subscription data usage, which I think we should change. Besides this one, everything else is just a opinionated comment hehe

[arbulu89]

Thanks @nelsonkopliku ,
Now we will need to see how we can really use this table hehe

[dottorblaster]

🎊🎉🍾