Update to v0.4.6 to fix debug data

This also includes a test to make sure debug data is marshalled
correctly.

go.mod

@@ -64,7 +64,7 @@ require (
 	github.com/grafana/loki/pkg/push v0.0.0-20231212100434-384e5c2dc872 // k180 branch
 	github.com/grafana/pyroscope-go/godeltaprof v0.1.7
 	github.com/grafana/pyroscope/api v0.4.0
-	github.com/grafana/pyroscope/ebpf v0.4.5
+	github.com/grafana/pyroscope/ebpf v0.4.6
 	github.com/grafana/regexp v0.0.0-20221123153739-15dc172cd2db
 	github.com/grafana/snowflake-prometheus-exporter v0.0.0-20221213150626-862cad8e9538
 	github.com/grafana/tail v0.0.0-20230510142333-77b18831edf0

go.sum

@@ -1072,8 +1072,10 @@ github.com/grafana/pyroscope-go/godeltaprof v0.1.7 h1:C11j63y7gymiW8VugJ9ZW0pWfx
 github.com/grafana/pyroscope-go/godeltaprof v0.1.7/go.mod h1:Tk376Nbldo4Cha9RgiU7ik8WKFkNpfds98aUzS8omLE=
 github.com/grafana/pyroscope/api v0.4.0 h1:J86DxoNeLOvtJhB1Cn65JMZkXe682D+RqeoIUiYc/eo=
 github.com/grafana/pyroscope/api v0.4.0/go.mod h1:MFnZNeUM4RDsDOnbgKW3GWoLSBpLzMMT9nkvhHHo81o=
-github.com/grafana/pyroscope/ebpf v0.4.5 h1:35WfAfCQxY4DiBzXsP5+xqhUEeO9ebgfo/VWqS4Q5Bg=
-github.com/grafana/pyroscope/ebpf v0.4.5/go.mod h1:0iOWpGm2M6KXiP2nGa4wf02knSSjEtu11vpUOdQT5AY=
+github.com/grafana/pyroscope/ebpf v0.4.6-0.20240426163159-8575ca65f70b h1:BXLaXB9gPvlbPeiwOkauVFvf7iaZwqS+BYCmHiAue64=
+github.com/grafana/pyroscope/ebpf v0.4.6-0.20240426163159-8575ca65f70b/go.mod h1:0iOWpGm2M6KXiP2nGa4wf02knSSjEtu11vpUOdQT5AY=
+github.com/grafana/pyroscope/ebpf v0.4.6 h1:8A6vddwCF2q8XXrOebFuDczr9xOHCfqPN2QwIkXKxgU=
+github.com/grafana/pyroscope/ebpf v0.4.6/go.mod h1:0iOWpGm2M6KXiP2nGa4wf02knSSjEtu11vpUOdQT5AY=
 github.com/grafana/regexp v0.0.0-20221123153739-15dc172cd2db h1:7aN5cccjIqCLTzedH7MZzRZt5/lsAHch6Z3L2ZGn5FA=
 github.com/grafana/regexp v0.0.0-20221123153739-15dc172cd2db/go.mod h1:M5qHK+eWfAv8VR/265dIuEpL3fNfeC21tXXp9itM24A=
 github.com/grafana/smimesign v0.2.1-0.20220408144937-2a5adf3481d3 h1:UPkAxuhlAcRmJT3/qd34OMTl+ZU7BLLfOO2+NXBlJpY=

internal/component/pyroscope/ebpf/ebpf_linux_test.go

@@ -9,17 +9,20 @@ import (
 	"testing"
 	"time"
 
-	"github.com/grafana/alloy/internal/component"
-	"github.com/grafana/alloy/internal/component/discovery"
-	"github.com/grafana/alloy/internal/component/pyroscope"
-	"github.com/grafana/alloy/internal/util"
-	"github.com/grafana/alloy/syntax"
 	ebpfspy "github.com/grafana/pyroscope/ebpf"
 	"github.com/grafana/pyroscope/ebpf/pprof"
 	"github.com/grafana/pyroscope/ebpf/sd"
+	"github.com/grafana/pyroscope/ebpf/symtab"
+	"github.com/grafana/pyroscope/ebpf/symtab/elf"
 	"github.com/oklog/run"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/stretchr/testify/require"
+
+	"github.com/grafana/alloy/internal/component"
+	"github.com/grafana/alloy/internal/component/discovery"
+	"github.com/grafana/alloy/internal/component/pyroscope"
+	"github.com/grafana/alloy/internal/util"
+	"github.com/grafana/alloy/syntax"
 )
 
 type mockSession struct {
@@ -68,7 +71,36 @@ func (m *mockSession) CollectProfiles(f pprof.CollectProfilesCallback) error {
 }
 
 func (m *mockSession) DebugInfo() interface{} {
-	return nil
+	return ebpfspy.SessionDebugInfo{
+		ElfCache: symtab.ElfCacheDebugInfo{
+			BuildIDCache: symtab.GCacheDebugInfo[elf.SymTabDebugInfo]{},
+			SameFileCache: symtab.GCacheDebugInfo[elf.SymTabDebugInfo]{
+				LRUSize:      10,
+				RoundSize:    10,
+				CurrentRound: 1,
+				LRUDump: []elf.SymTabDebugInfo{
+					{
+						Name:          "X",
+						Size:          123,
+						LastUsedRound: 1,
+					},
+				},
+			},
+		},
+		PidCache: symtab.GCacheDebugInfo[symtab.ProcTableDebugInfo]{
+			LRUSize:      10,
+			RoundSize:    10,
+			CurrentRound: 1,
+			LRUDump: []symtab.ProcTableDebugInfo{
+				{
+					Pid:  666,
+					Size: 123,
+				},
+			},
+		},
+		Arch:   "my-arch",
+		Kernel: "my-kernel",
+	}
 }
 
 func TestShutdownOnError(t *testing.T) {
@@ -244,6 +276,77 @@ pid_map_size = 0
 	}
 }
 
+type mockTargetFinder struct {
+	sd.TargetFinder
+}
+
+func (m *mockTargetFinder) DebugInfo() []map[string]string {
+	return []map[string]string{
+		{"__container_id__": "foo", "__name__": "process_cpu", "container": "kube-proxy"},
+		{"__container_id__": "baz", "__name__": "process_cpu", "container": "kube-proxy"},
+	}
+}
+
+func TestDebugInfo(t *testing.T) {
+	c := &Component{
+		session:      &mockSession{},
+		targetFinder: &mockTargetFinder{},
+	}
+
+	c.updateDebugInfo()
+	di := c.DebugInfo()
+
+	v, err := syntax.Marshal(di)
+	require.NoError(t, err)
+
+	require.Equal(t, `targets = [{
+	__container_id__ = "foo",
+	__name__         = "process_cpu",
+	container        = "kube-proxy",
+}, {
+	__container_id__ = "baz",
+	__name__         = "process_cpu",
+	container        = "kube-proxy",
+}]
+session = {
+	elf_cache = {
+		build_id_cache = {
+			lru_size      = 0,
+			round_size    = 0,
+			current_round = 0,
+			lru_dump      = [],
+			round_dump    = [],
+		},
+		same_file_cache = {
+			lru_size      = 10,
+			round_size    = 10,
+			current_round = 1,
+			lru_dump      = [{
+				name            = "X",
+				symbol_count    = 123,
+				file            = "",
+				last_used_round = 1,
+			}],
+			round_dump = [],
+		},
+	},
+	pid_cache = {
+		lru_size      = 10,
+		round_size    = 10,
+		current_round = 1,
+		lru_dump      = [{
+			elfs = {},
+			size            = 123,
+			pid             = 666,
+			last_used_round = 0,
+		}],
+		round_dump = [],
+	},
+	arch   = "my-arch",
+	kernel = "my-kernel",
+}`, string(v))
+}
+
 func newTestComponent(opts component.Options, args Arguments, session *mockSession, targetFinder sd.TargetFinder, ms *metrics) *Component {
 	alloyAppendable := pyroscope.NewFanout(args.ForwardTo, opts.ID, opts.Registerer)
 	res := &Component{