[receiver/hostmetrics] Add Pressure Stall Information (PSI) scraper

Author: alpineQ

.chloggen/42779-psi.yaml

@@ -0,0 +1,10 @@
+change_type: enhancement
+
+component: receiver/hostmetrics
+
+note: Pressure Stall Information (PSI) from linux hosts
+issues: [42779]
+
+subtext: Added support for Linux 4.20+ new Pressure Stall Information metrics
+
+change_logs: [user,api]

.github/CODEOWNERS

@@ -273,6 +273,7 @@ receiver/hostmetricsreceiver/internal/scraper/nfsscraper/        @open-telemetry
 receiver/hostmetricsreceiver/internal/scraper/pagingscraper/     @open-telemetry/collector-contrib-approvers @dmitryax @braydonk
 receiver/hostmetricsreceiver/internal/scraper/processesscraper/  @open-telemetry/collector-contrib-approvers @dmitryax @braydonk
 receiver/hostmetricsreceiver/internal/scraper/processscraper/    @open-telemetry/collector-contrib-approvers @dmitryax @braydonk
+receiver/hostmetricsreceiver/internal/scraper/psiscraper/        @open-telemetry/collector-contrib-approvers @alpineq
 receiver/hostmetricsreceiver/internal/scraper/systemscraper/     @open-telemetry/collector-contrib-approvers @dmitryax @braydonk
 receiver/httpcheckreceiver/                                      @open-telemetry/collector-contrib-approvers @codeboten @VenuEmmadi
 receiver/huaweicloudcesreceiver/                                 @open-telemetry/collector-contrib-approvers @heitorganzeli @narcis96 @mwear

.github/ISSUE_TEMPLATE/beta_stability.yaml

@@ -274,6 +274,7 @@ body:
       - receiver/hostmetrics/internal/scraper/pagingscraper
       - receiver/hostmetrics/internal/scraper/processesscraper
       - receiver/hostmetrics/internal/scraper/processscraper
+      - receiver/hostmetrics/internal/scraper/psiscraper
       - receiver/hostmetrics/internal/scraper/systemscraper
       - receiver/httpcheck
       - receiver/huaweicloudces

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -277,6 +277,7 @@ body:
       - receiver/hostmetrics/internal/scraper/pagingscraper
       - receiver/hostmetrics/internal/scraper/processesscraper
       - receiver/hostmetrics/internal/scraper/processscraper
+      - receiver/hostmetrics/internal/scraper/psiscraper
       - receiver/hostmetrics/internal/scraper/systemscraper
       - receiver/httpcheck
       - receiver/huaweicloudces

.github/ISSUE_TEMPLATE/feature_request.yaml

@@ -271,6 +271,7 @@ body:
       - receiver/hostmetrics/internal/scraper/pagingscraper
       - receiver/hostmetrics/internal/scraper/processesscraper
       - receiver/hostmetrics/internal/scraper/processscraper
+      - receiver/hostmetrics/internal/scraper/psiscraper
       - receiver/hostmetrics/internal/scraper/systemscraper
       - receiver/httpcheck
       - receiver/huaweicloudces

.github/ISSUE_TEMPLATE/other.yaml

@@ -271,6 +271,7 @@ body:
       - receiver/hostmetrics/internal/scraper/pagingscraper
       - receiver/hostmetrics/internal/scraper/processesscraper
       - receiver/hostmetrics/internal/scraper/processscraper
+      - receiver/hostmetrics/internal/scraper/psiscraper
       - receiver/hostmetrics/internal/scraper/systemscraper
       - receiver/httpcheck
       - receiver/huaweicloudces

.github/ISSUE_TEMPLATE/unmaintained.yaml

@@ -276,6 +276,7 @@ body:
       - receiver/hostmetrics/internal/scraper/pagingscraper
       - receiver/hostmetrics/internal/scraper/processesscraper
       - receiver/hostmetrics/internal/scraper/processscraper
+      - receiver/hostmetrics/internal/scraper/psiscraper
       - receiver/hostmetrics/internal/scraper/systemscraper
       - receiver/httpcheck
       - receiver/huaweicloudces

receiver/hostmetricsreceiver/README.md

@@ -57,6 +57,7 @@ The available scrapers are:
 | [paging]     | All                          | Paging/Swap space utilization and I/O metrics          |
 | [processes]  | Linux, Mac, FreeBSD, OpenBSD | Process count metrics                                  |
 | [process]    | Linux, Windows, Mac, FreeBSD | Per process CPU, Memory, and Disk I/O metrics          |
+| [psi]        | Linux                        | Pressure Stall Information (PSI) metrics               |
 | [system]     | Linux, Windows, Mac          | Miscellaneous system metrics                           |
 
 [cpu]: ./internal/scraper/cpuscraper/documentation.md
@@ -69,6 +70,7 @@ The available scrapers are:
 [paging]: ./internal/scraper/pagingscraper/documentation.md
 [processes]: ./internal/scraper/processesscraper/documentation.md
 [process]: ./internal/scraper/processscraper/documentation.md
+[psi]: ./internal/scraper/psiscraper/documentation.md
 [system]: ./internal/scraper/systemscraper/documentation.md
 
 ### Notes

receiver/hostmetricsreceiver/factory.go

@@ -29,6 +29,7 @@ import (
 	"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/hostmetricsreceiver/internal/scraper/pagingscraper"
 	"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/hostmetricsreceiver/internal/scraper/processesscraper"
 	"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/hostmetricsreceiver/internal/scraper/processscraper"
+	"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/hostmetricsreceiver/internal/scraper/psiscraper"
 	"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/hostmetricsreceiver/internal/scraper/systemscraper"
 )
 
@@ -49,6 +50,7 @@ var (
 		pagingscraper.NewFactory(),
 		processesscraper.NewFactory(),
 		processscraper.NewFactory(),
+		psiscraper.NewFactory(),
 		systemscraper.NewFactory(),
 	)
 )

receiver/hostmetricsreceiver/internal/scraper/psiscraper/config.go

@@ -0,0 +1,20 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package psiscraper // import "github.com/open-telemetry/opentelemetry-collector-contrib/receiver/hostmetricsreceiver/internal/scraper/psiscraper"
+
+import (
+	"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/hostmetricsreceiver/internal/scraper/psiscraper/internal/metadata"
+)
+
+// Config relating to PSI Metric Scraper.
+type Config struct {
+	// MetricsBuilderConfig allows to customize scraped metrics/attributes representation.
+	metadata.MetricsBuilderConfig `mapstructure:",squash"`
+	// RootPath is the host's root directory (linux only).
+	RootPath string `mapstructure:"-"`
+}
+
+func (cfg *Config) SetRootPath(rootPath string) {
+	cfg.RootPath = rootPath
+}