diff --git a/test/benchmarks/fs/fsbench/fsbench.go b/test/benchmarks/fs/fsbench/fsbench.go
index f468eba76..55f7ee88a 100644
--- a/test/benchmarks/fs/fsbench/fsbench.go
+++ b/test/benchmarks/fs/fsbench/fsbench.go
@@ -45,6 +45,10 @@ type FSBenchmark struct {
 	// Variants is a list of benchmarka variants to run.
 	// If unset, the typical set is used.
 	Variants []Variant
+	// Callback is an optional function that is called after each execution of
+	// the workload being benchmarked. It can be used to perform workload
+	// specific metric reporting.
+	Callback func(b *testing.B, output string)
 }
 
 // Variant is a specific configuration for a benchmark.
@@ -153,6 +157,10 @@ func RunWithDifferentFilesystems(ctx context.Context, b *testing.B, machine harn
 					b.Fatalf("string %s not in: %s", bm.WantOutput, got)
 				}
 
+				if bm.Callback != nil {
+					bm.Callback(b, got)
+				}
+
 				// Clean the container in case we are doing another run.
 				if i < b.N-1 && len(bm.CleanCmd) != 0 {
 					if _, err = container.Exec(ctx, dockerutil.ExecOpts{
diff --git a/test/benchmarks/fs/rubydev_test.go b/test/benchmarks/fs/rubydev_test.go
index 340540dff..e0c376cf9 100644
--- a/test/benchmarks/fs/rubydev_test.go
+++ b/test/benchmarks/fs/rubydev_test.go
@@ -19,6 +19,8 @@ import (
 	"context"
 	"fmt"
 	"os"
+	"regexp"
+	"strconv"
 	"strings"
 	"testing"
 
@@ -52,6 +54,14 @@ func BenchmarkRubyNoOpTest(b *testing.B) {
 	}, nil)
 }
 
+func extractLoadTime(output string) (float64, error) {
+	submatches := regexp.MustCompile(`files took (\d[\d,]*[\.]?[\d]*) seconds to load`).FindStringSubmatch(output)
+	if len(submatches) != 2 {
+		return 0, fmt.Errorf("count not find load time in output = %q", output)
+	}
+	return strconv.ParseFloat(submatches[1], 64)
+}
+
 // BenchmarkRubySpecTest runs a complex test suite from the Fastlane project:
 // https://github.com/fastlane/fastlane
 func BenchmarkRubySpecTest(b *testing.B) {
@@ -60,6 +70,14 @@ func BenchmarkRubySpecTest(b *testing.B) {
 		WorkDir:    "/fastlane",
 		RunCmd:     []string{"bash", "/files/run_fastlane_tests.sh"},
 		WantOutput: "3613 examples, 0 failures",
+		Callback: func(b *testing.B, output string) {
+			loadTime, err := extractLoadTime(output)
+			if err != nil {
+				b.Errorf("failed to extract load time from fastlane test suite output: %v", err)
+				return
+			}
+			b.ReportMetric(loadTime, "load-sec")
+		},
 	}, []string{
 		// Fastlane tests pollute the filesystem a lot.
 		// To find out, run `find / -exec stat  -c "%n %y" {} \; | sort` before and after running tests