[receiver/vcenter] Add vCenter Host metrics (dropped packet rate + capacity) (#33646)

**Description:** <Describe what has changed.>
<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
The following PR adds the following metrics
```
vcenter.host.network.packet.drop.rate
vcenter.host.cpu.capacity
vcenter.host.cpu.reserve.capacity
```
These metrics can be found in the following links respectively:
[errorTx and
errorRx](https://vdc-repo.vmware.com/vmwb-repository/dcr-public/d1902b0e-d479-46bf-8ac9-cee0e31e8ec0/07ce8dbd-db48-4261-9b8f-c6d3ad8ba472/network_counters.html)
[reservedCapacity and
totalCapacity](https://vdc-repo.vmware.com/vmwb-repository/dcr-public/d1902b0e-d479-46bf-8ac9-cee0e31e8ec0/07ce8dbd-db48-4261-9b8f-c6d3ad8ba472/cpu_counters.html)

**Link to tracking Issue:** #33607

**Testing:** <Describe what testing was performed and which tests were
added.>
Tested against a live environment to scrape added metrics, and updated
golden test files.

**Documentation:** <Describe the documentation added.>
Updated documentation through mdatagen.

Author: BominRahmani

.chloggen/vcenter_add_host_metrics.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: vcenterreceiver
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: "Adds vCenter CPU capacity and network drop rate metrics to hosts."
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [33607]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [user]

go.mod

@@ -10,6 +10,9 @@ module github.com/open-telemetry/opentelemetry-collector-contrib
 
 go 1.21.0
 
+// Replace references to modules that are in this repository with their relateive paths
+// so that we always build with current (latest) version of the source code.
+
 // see https://github.com/google/gnostic/issues/262
 replace github.com/googleapis/gnostic v0.5.6 => github.com/googleapis/gnostic v0.5.5
 

receiver/vcenterreceiver/documentation.md

@@ -487,6 +487,45 @@ metrics:
     enabled: true
 ```
 
+### vcenter.host.cpu.capacity
+
+Total CPU capacity of the host system.
+
+| Unit | Metric Type | Value Type | Aggregation Temporality | Monotonic |
+| ---- | ----------- | ---------- | ----------------------- | --------- |
+| MHz | Sum | Int | Cumulative | false |
+
+### vcenter.host.cpu.reserved
+
+The CPU of the host reserved for use by virtual machines.
+
+| Unit | Metric Type | Value Type | Aggregation Temporality | Monotonic |
+| ---- | ----------- | ---------- | ----------------------- | --------- |
+| MHz | Sum | Int | Cumulative | false |
+
+#### Attributes
+
+| Name | Description | Values |
+| ---- | ----------- | ------ |
+| cpu_reservation_type | The type of CPU reservation for the host. | Str: ``total``, ``used`` |
+
+### vcenter.host.network.packet.drop.rate
+
+The rate of packets dropped across each physical NIC (network interface controller) instance on the host.
+
+As measured over the most recent 20s interval.
+
+| Unit | Metric Type | Value Type |
+| ---- | ----------- | ---------- |
+| {packets/sec} | Gauge | Double |
+
+#### Attributes
+
+| Name | Description | Values |
+| ---- | ----------- | ------ |
+| direction | The direction of network throughput. | Str: ``transmitted``, ``received`` |
+| object | The object on the virtual machine or host that is being reported on. | Any Str |
+
 ### vcenter.vm.cpu.readiness
 
 Percentage of time that the virtual machine was ready, but could not get scheduled to run on the physical CPU.