[receiver/nsxreceiver] Add NSX-T Metrics Receiver

[schmikei]

Description:

This adds a new component the nsxreceiver outlined in #9568 🚀

This component will support just themetrics telemetry type and sources those metrics via the NSX Rest API.

Users will need permissions to read properties/statistics from the Nodes. The LPU I believe is needed is an “Auditor”

I have tested on NSX-T DataCenter 3.1.2 pretty extensively.

Decided not to use the library https://github.com/vmware/go-vmware-nsxt because it appears to be out of date with most structs only touched 5 years ago, because of this I just created API structs/imported structs that the Metric Collection requires.

Example Configuration

receivers:
  nsx:
    collection_interval: 10s
    endpoint: https://nsx.australia-southeast1.gve.goog
    username: admin
    password: password

exporters:
  file:
    path: "./content.json"

service:
  pipelines:
    metrics:
      receivers: [nsx]
      exporters: [file]

List of planned metrics/statistics grabbed from API

[
  "nsx.interface.packet.count",
  "nsx.interface.throughput",
  "nsx.node.cache.memory.usage",
  "nsx.node.memory.usage",
  "nsx.node.cpu.utilization",
  "nsx.node.disk.usage",
  "nsx.node.disk.utilization"
]

Link to tracking Issue: #9568

Testing:

Test Coverage

As of submission unit test coverage of 95.4:

opentelemetry-collector-contrib/receiver/nsxreceiver nsxreceiver-metrics via 🐹 v1.17
➜ go test ./... -cover
ok  	github.com/open-telemetry/opentelemetry-collector-contrib/receiver/nsxreceiver	0.760s	coverage: 95.4% of statements
?   	github.com/open-telemetry/opentelemetry-collector-contrib/receiver/nsxreceiver/internal/metadata	[no test files]
?   	github.com/open-telemetry/opentelemetry-collector-contrib/receiver/nsxreceiver/internal/model	[no test files]

Documentation:

README.md was added along with derived metadata.yaml documentation in documentation.md

[dashpole]

Ah, great. I was wondering when this PR would land. I'll take a look soon

[schmikei]

Noticed same CI failures for windows-msi on a couple commits in main. Don't think its related to this PR

https://github.com/open-telemetry/opentelemetry-collector-contrib/runs/6394288555?check_suite_focus=true

[djaglowski]

Looks good, but a couple minor things need to be addressed.