HostMetricsReceiver Process scraper drops metrics on machines that don't support cgroup. #43640
Description
Component(s)
receiver/hostmetrics/internal/scraper/processscraper
What happened?
Description
One one of our target machine types we do not have a /proc//cgroup file because the device does not use cgroups. This causes the process scraper to skip the publishing the metric.
Steps to Reproduce
Deploy collector with a HostMetricReceiver on a machine without cgroup support.
Expected Result
Process metrics without a cgroup specified will exist
Actual Result
No Process metrics exist
Collector version
v0.137.0
Environment information
Environment
OS: (e.g., "Ubuntu 20.04")
Compiler(if manually compiled): (e.g., "go 14.2")
OpenTelemetry Collector configuration
receivers:
hostmetrics:
process:Log output
2025-10-17T21:14:21.603Z error [email protected]/obs_metrics.go:61 Error scraping metrics {"resource": {"service.instance.id": "67ad18cd-27ac-450e-bd4e-5d8da1edecb9", "service.name": "otelcontribcol", "service.version": "0.137.0"}, "otelcol.component.id": "hostmetrics", "otelcol.component.kind": "receiver", "otelcol.signal": "metrics", "error": "error reading process cgroup for pid 27926: open /proc/27926/cgroup: no such file or directory"}
go.opentelemetry.io/collector/scraper/scraperhelper.wrapObsMetrics.func1
go.opentelemetry.io/collector/scraper/[email protected]/obs_metrics.go:61
go.opentelemetry.io/collector/scraper.ScrapeMetricsFunc.ScrapeMetrics
go.opentelemetry.io/collector/[email protected]/metrics.go:24
go.opentelemetry.io/collector/scraper/scraperhelper.scrapeMetrics
go.opentelemetry.io/collector/scraper/[email protected]/controller.go:256
go.opentelemetry.io/collector/scraper/scraperhelper.NewMetricsController.func1
go.opentelemetry.io/collector/scraper/[email protected]/controller.go:228
go.opentelemetry.io/collector/scraper/scraperhelper.(*controller[...]).startScraping.func1
go.opentelemetry.io/collector/scraper/[email protected]/controller.go:175
root@PCVRNBA102023-1:/var/log# cat /etc/otel/config.ymlAdditional context
No response
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