Adding upstream version 1.34.4.

Signed-off-by: Daniel Baumann <daniel@debian.org>

plugins/inputs/kernel/psi.go

@@ -0,0 +1,51 @@
+//go:build linux
+
+package kernel
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/prometheus/procfs"
+
+	"github.com/influxdata/telegraf"
+)
+
+// Gather PSI metrics
+func (k *Kernel) gatherPressure(acc telegraf.Accumulator) error {
+	for _, resource := range []string{"cpu", "memory", "io"} {
+		now := time.Now()
+		psiStats, err := k.procfs.PSIStatsForResource(resource)
+		if err != nil {
+			return fmt.Errorf("failed to read %s pressure: %w", resource, err)
+		}
+
+		stats := map[string]*procfs.PSILine{
+			"some": psiStats.Some,
+			"full": psiStats.Full,
+		}
+
+		for _, typ := range []string{"some", "full"} {
+			if resource == "cpu" && typ == "full" {
+				// resource=cpu,type=full is omitted because it is always zero
+				continue
+			}
+
+			tags := map[string]string{
+				"resource": resource,
+				"type":     typ,
+			}
+			stat := stats[typ]
+
+			acc.AddCounter("pressure", map[string]interface{}{
+				"total": stat.Total,
+			}, tags, now)
+			acc.AddGauge("pressure", map[string]interface{}{
+				"avg10":  stat.Avg10,
+				"avg60":  stat.Avg60,
+				"avg300": stat.Avg300,
+			}, tags, now)
+		}
+	}
+	return nil
+}