},
		[]string{"status"},
	)
)

func init() {
	legacyregistry.MustRegister(
		requestLatency,
		requestCount,
		fetchCount,
		activeFetchCount,
	)
}

const (
	hitTag  = "hit"
	missTag = "miss"

	fetchFailedTag = "error"
	fetchOkTag     = "ok"

	fetchInFlightTag = "in_flight"
	fetchBlockedTag  = "blocked"
)

type statsCollector struct{}

	marshalFailure      = "marshal_failure"
	unmarshalFailure    = "unmarshal_failure"
	fetchFailure        = "fetch_failure"
	missRemoteFetchHint = "miss_remote_fetch_hint"
)

var (
	hitTag    = monitoring.CreateLabel("hit")
	resultTag = monitoring.CreateLabel("result")

	wasmCacheEntries = monitoring.NewGauge(
		"wasm_cache_entries",
		"number of Wasm remote fetch cache entries.",
	)

	iexportVersionGo1_18   = 2

	iexportVersionCurrent = 2
)

type ident struct {
	pkg  *types.Package
	name string
}

const predeclReserved = 32

type itag uint64

const (
	// Types
	definedType itag = iota
	pointerType
	sliceType
	arrayType
	chanType
	mapType
	signatureType
	structType
	interfaceType
	typeParamType
	instanceType
	unionType
)

func (c *LocalFileCache) getEntry(key cacheKey, ignoreResourceVersion bool) (*cacheEntry, string) {
	cacheHit := false

	c.mux.Lock()
	defer func() {
		c.mux.Unlock()
		wasmCacheLookupCount.With(hitTag.Value(strconv.FormatBool(cacheHit))).Increment()
	}()

	if len(key.checksum) == 0 && strings.HasPrefix(key.downloadURL, ociURLPrefix) {
		if d, err := name.NewDigest(key.downloadURL[len(ociURLPrefix):]); err == nil {