NSOF-8274 receiver/hostmetricsreceiver:processscraper: Workaround pro…

…cess createTime bogus value

Process createTime collected using gopsutils/process module and uses as
startTime of metric sequence.
When running inside lxc, function that calculates create time mixes host
and guest stats.
See shirou/gopsutil#1562 for more details
This leads to two issues:
1. Calculated createTime has future value eventually causing scrapper to
skip process collection.
2. dp series startTime is set to future in time value, the consequences
   are unknown.
In order to overcome this issue, we will set createTime to system boot time.
In case of lxc, container boot time

receiver/hostmetricsreceiver/internal/scraper/processscraper/process_scraper.go

@@ -11,6 +11,7 @@ import (
 	"time"
 
 	"github.com/shirou/gopsutil/v3/common"
+	"github.com/shirou/gopsutil/v3/host"
 	"github.com/shirou/gopsutil/v3/process"
 	"go.opentelemetry.io/collector/component"
 	"go.opentelemetry.io/collector/pdata/pcommon"
@@ -54,6 +55,7 @@ type scraper struct {
 	getProcessHandles    func(context.Context) (processHandles, error)
 
 	handleCountManager handlecount.Manager
+	bootTime           int64
 }
 
 // newProcessScraper creates a Process Scraper
@@ -87,8 +89,15 @@ func newProcessScraper(settings receiver.CreateSettings, cfg *Config) (*scraper,
 	return scraper, nil
 }
 
-func (s *scraper) start(context.Context, component.Host) error {
+func (s *scraper) start(ctx context.Context, _ component.Host) error {
 	s.mb = metadata.NewMetricsBuilder(s.config.MetricsBuilderConfig, s.settings)
+	ctx = context.WithValue(ctx, common.EnvKey, s.config.EnvMap)
+	bt, err := host.BootTimeWithContext(ctx)
+	if err == nil {
+		s.bootTime = int64(bt) * 1000
+	} else {
+		s.bootTime = time.Now().UnixMilli()
+	}
 	return nil
 }
 
@@ -225,9 +234,17 @@ func (s *scraper) getProcessMetadata() ([]*processMetadata, error) {
 		createTime, err := s.getProcessCreateTime(handle, ctx)
 		if err != nil {
 			errs.AddPartial(0, fmt.Errorf("error reading create time for process %q (pid %v): %w", executable.name, pid, err))
-			// set the start time to now to avoid including this when a scrape_process_delay is set
-			createTime = time.Now().UnixMilli()
+			// set the start time to boot time
+			createTime = s.bootTime
 		}
+
+		if time.Now().UnixMilli() < createTime {
+			// getProcessCreateTime is bogus for lxc env
+			// see https://github.com/shirou/gopsutil/issues/1562
+			// use container boot time as createTime => resource startTime
+			createTime = s.bootTime
+		}
+
 		if s.scrapeProcessDelay.Milliseconds() > (time.Now().UnixMilli() - createTime) {
 			continue
 		}