hostmetrics: Adding process.uptime metric (#37492)

#### Description
Adding new metric into hostmetric process scraper to track process
uptime

#### Link to tracking issue
Fixes
#36667

#### Testing

Added tests to validate coverage.

#### Documentation

Added as part of mdatagen

Author: MovieStoreGuy

.chloggen/msg_process-uptime-addition.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: hostmetrics/process
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Added support for tracking process.uptime
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [36667]
+
+# (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]

connector/datadogconnector/go.sum

@@ -334,6 +334,7 @@ require (
 	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/stormcat24/protodep v0.1.8 // indirect
 	github.com/stretchr/objx v0.5.2 // indirect
+	github.com/tilinna/clock v1.1.0 // indirect
 	github.com/tinylib/msgp v1.2.5 // indirect
 	github.com/tklauser/go-sysconf v0.3.14 // indirect
 	github.com/tklauser/numcpus v0.8.0 // indirect

exporter/datadogexporter/go.mod

@@ -12,6 +12,7 @@ require (
 	github.com/prometheus/procfs v0.15.1
 	github.com/shirou/gopsutil/v4 v4.24.12
 	github.com/stretchr/testify v1.10.0
+	github.com/tilinna/clock v1.1.0
 	github.com/yusufpapurcu/wmi v1.2.4
 	go.opentelemetry.io/collector/component v0.118.1-0.20250123125445-24f88da7b583
 	go.opentelemetry.io/collector/component/componenttest v0.118.1-0.20250123125445-24f88da7b583

exporter/datadogexporter/go.sum

@@ -172,6 +172,14 @@ Process threads count.
 | ---- | ----------- | ---------- | ----------------------- | --------- |
 | {threads} | Sum | Int | Cumulative | false |
 
+### process.uptime
+
+The time the process has been running.
+
+| Unit | Metric Type | Value Type |
+| ---- | ----------- | ---------- |
+| s | Gauge | Double |
+
 ## Resource Attributes
 
 | Name | Description | Values | Enabled |