Surface GCP SDK HTTP wire logs at V(5)

Inject an option.WithLogger slog logger bridged to the zap sink via
logr.ToSlogHandler with a V(1) shift, so the SDK's Debug-level
"api request"/"api response" records (URL, headers, full payloads)
appear only at --zap-log-level=5. Startup warning when active, since
raw insert payloads include cloud-init user-data. Note WithLogger
overrides GOOGLE_SDK_GO_LOGGING_LEVEL for this client.

Co-Authored-By: Claude <noreply@anthropic.com>

internal/provider/gcp/gcp.go

@@ -9,6 +9,7 @@ package gcp
 import (
 	"context"
 	"fmt"
+	"log/slog"
 	"strings"
 	"time"
 
@@ -16,6 +17,7 @@ import (
 	"cloud.google.com/go/compute/apiv1/computepb"
 	"github.com/go-logr/logr"
 	"google.golang.org/api/iterator"
+	"google.golang.org/api/option"
 	"google.golang.org/protobuf/proto"
 	logf "sigs.k8s.io/controller-runtime/pkg/log"
 
@@ -83,12 +85,28 @@ type Provider struct {
 	api  instancesAPI
 }
 
+// wireLogger returns the slog logger handed to the SDK: its Debug-level
+// "api request"/"api response" records (slog Debug = +4 on the logr
+// scale) land at V(5) on top of the base's V(1) shift.
+func wireLogger(base logr.Logger) *slog.Logger {
+	return slog.New(logr.ToSlogHandler(base.V(1)))
+}
+
 // New builds a Provider using Application Default Credentials (workload
 // identity in-cluster, gcloud ADC locally — no key-file plumbing).
 // Deliberately untested: it dials real Google endpoints; everything below
 // it is exercised through newWithAPI.
+//
+// The injected wire logger surfaces the SDK's raw HTTP request/response
+// records at V(5); note option.WithLogger overrides the SDK's own
+// GOOGLE_SDK_GO_LOGGING_LEVEL env var, so --zap-log-level is the only knob.
 func New(ctx context.Context, pc provider.ProviderConfig) (provider.Provider, error) {
-	client, err := compute.NewInstancesRESTClient(ctx)
+	base := logf.Log.WithName("gcp").WithName("http")
+	if base.V(5).Enabled() {
+		logf.Log.WithName("gcp").Info(
+			"GCP HTTP wire logging active — request payloads include cloud-init user-data")
+	}
+	client, err := compute.NewInstancesRESTClient(ctx, option.WithLogger(wireLogger(base)))
 	if err != nil {
 		return nil, fmt.Errorf("creating GCP instances client: %w", err)
 	}

internal/provider/gcp/gcp_test.go

@@ -397,6 +397,55 @@ func TestLogging_verbosityTiers(t *testing.T) {
 	}
 }
 
+func TestWireLogger_gatesAtV5(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		name      string
+		verbosity int
+		wantDebug bool
+	}{
+		{name: "v5 shows wire records", verbosity: 5, wantDebug: true},
+		{name: "v4 hides wire records", verbosity: 4, wantDebug: false},
+		{name: "v2 hides wire records", verbosity: 2, wantDebug: false},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+			lines := &[]string{}
+			base := funcr.New(func(prefix, args string) {
+				*lines = append(*lines, prefix+" "+args)
+			}, funcr.Options{Verbosity: tc.verbosity})
+
+			slogger := wireLogger(base)
+			slogger.Debug("api request", "rpcName", "Insert")
+
+			joined := strings.Join(*lines, "\n")
+			if got := strings.Contains(joined, "api request"); got != tc.wantDebug {
+				t.Errorf("Debug record visible = %v, want %v; output:\n%s", got, tc.wantDebug, joined)
+			}
+			if tc.wantDebug && !strings.Contains(joined, "rpcName") {
+				t.Errorf("wire record lost its attrs:\n%s", joined)
+			}
+		})
+	}
+}
+
+func TestWireLogger_infoLandsAtV1(t *testing.T) {
+	t.Parallel()
+	lines := &[]string{}
+	base := funcr.New(func(prefix, args string) {
+		*lines = append(*lines, prefix+" "+args)
+	}, funcr.Options{Verbosity: 1})
+
+	wireLogger(base).Info("hello")
+
+	if joined := strings.Join(*lines, "\n"); !strings.Contains(joined, "hello") {
+		t.Errorf("slog Info should land at V(1) and be visible at verbosity 1; output:\n%s", joined)
+	}
+}
+
 func TestLogging_apiErrorKeepsHTTPDetail(t *testing.T) {
 	t.Parallel()
 	ctx, lines := captureContext(1)