[receiver/hostmetrics] Remove deprecated process memory metrics (#18531)

This is the last step of renaming the metrics process.memory.physical_usage and process.memory.virtual_usage to spec-compliant names process.memory.usage and process.memory.virtual. It should be released in v0.72.0.

.chloggen/remove-deprecated-hostmetrics-receiver-metrics.yaml

@@ -0,0 +1,19 @@
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: breaking
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: hostmetricsreceiver
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Remove deprecated process memory metrics
+
+# One or more tracking issues related to the change
+issues: [14327]
+
+# (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: |
+  The metrics `process.memory.physical_usage` and `process.memory.virtual_usage` have been deprecated since v0.64.0.
+  They are now being removed. You should use the following metrics instead: `process.memory.usage`, `process.memory.virtual`.
+  For details, see the [docs](https://github.com/open-telemetry/opentelemetry-collector-contrib/tree/v0.71.0/receiver/hostmetricsreceiver#transition-to-process-memory-metric-names-aligned-with-opentelemetry-specification).

receiver/hostmetricsreceiver/README.md

@@ -177,53 +177,6 @@ Currently, the hostmetrics receiver does not set any Resource attributes on the
 export OTEL_RESOURCE_ATTRIBUTES="service.name=<the name of your service>,service.namespace=<the namespace of your service>,service.instance.id=<uuid of the instance>"
 ```
 
-## Deprecations
-
-### Transition to process memory metric names aligned with OpenTelemetry specification
-
-The Host Metrics receiver has been emitting the following process memory metrics:
-
-- [process.memory.physical_usage] for the amount of physical memory used by the process,
-- [process.memory.virtual_usage] for the amount of virtual memory used by the process.
-
-This is in conflict with the OpenTelemetry specification,
-which defines [process.memory.usage] and [process.memory.virtual] as the names for these metrics.
-
-To align the emitted metric names with the OpenTelemetry specification,
-the following process will be followed to phase out the old metrics:
-
-- Until and including `v0.63.0`, only the old metrics `process.memory.physical_usage` and `process.memory.virtual_usage` are emitted.
-  You can use the [Metrics Transform processor][metricstransformprocessor_docs] to rename them.
-- Between `v0.64.0` and `v0.68.0`, the new metrics are introduced as optional (disabled by default) and the old metrics are marked as deprecated.
-  Only the old metrics are emitted by default.
-- Between `v0.69.0` and `v0.71.0`, the new metrics are enabled and the old metrics are disabled by default.
-- In `v0.72.0` and up, the old metrics are removed.
-
-To change the enabled state for the specific metrics, use the standard configuration options that are available for all metrics.
-
-Here's an example configuration to disable the old metrics and enable the new metrics:
-
-```yaml
-receivers:
-  hostmetrics:
-    scrapers:
-      process:
-        metrics:
-          process.memory.physical_usage:
-            enabled: false
-          process.memory.virtual_usage:
-            enabled: false
-          process.memory.usage:
-            enabled: true
-          process.memory.virtual:
-            enabled: true
-```
-
 [beta]: https://github.com/open-telemetry/opentelemetry-collector#beta
 [contrib]: https://github.com/open-telemetry/opentelemetry-collector-releases/tree/main/distributions/otelcol-contrib
 [core]: https://github.com/open-telemetry/opentelemetry-collector-releases/tree/main/distributions/otelcol
-[process.memory.physical_usage]: https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/v0.63.0/receiver/hostmetricsreceiver/internal/scraper/processscraper/metadata.yaml#L61
-[process.memory.virtual_usage]: https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/v0.63.0/receiver/hostmetricsreceiver/internal/scraper/processscraper/metadata.yaml#L70
-[process.memory.usage]: https://github.com/open-telemetry/opentelemetry-specification/blob/v1.14.0/specification/metrics/semantic_conventions/process-metrics.md?plain=1#L38
-[process.memory.virtual]: https://github.com/open-telemetry/opentelemetry-specification/blob/v1.14.0/specification/metrics/semantic_conventions/process-metrics.md?plain=1#L39
-[metricstransformprocessor_docs]: https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/v0.63.0/processor/metricstransformprocessor/README.md

receiver/hostmetricsreceiver/internal/scraper/processscraper/documentation.md

@@ -108,14 +108,6 @@ Number of disk operations performed by the process.
 | ---- | ----------- | ------ |
 | direction | Direction of flow of bytes (read or write). | Str: ``read``, ``write`` |
 
-### process.memory.physical_usage
-
-[DEPRECATED] Use `process.memory.usage` metric instead. The amount of physical memory in use.
-
-| Unit | Metric Type | Value Type | Aggregation Temporality | Monotonic |
-| ---- | ----------- | ---------- | ----------------------- | --------- |
-| By | Sum | Int | Cumulative | false |
-
 ### process.memory.utilization
 
 Percentage of total physical memory that is used by the process.
@@ -124,14 +116,6 @@ Percentage of total physical memory that is used by the process.
 | ---- | ----------- | ---------- |
 | 1 | Gauge | Double |
 
-### process.memory.virtual_usage
-
-[DEPRECATED] Use `process.memory.virtual` metric instead. Virtual memory size.
-
-| Unit | Metric Type | Value Type | Aggregation Temporality | Monotonic |
-| ---- | ----------- | ---------- | ----------------------- | --------- |
-| By | Sum | Int | Cumulative | false |
-
 ### process.open_file_descriptors
 
 Number of file descriptors in use by the process.