recordStoreFlush method
bytes is null when the key was removed.
Implementation
void recordStoreFlush(String key, {required int? bytes, bool spilled = false}) {
_storeFlushes += 1;
if (bytes == null) {
_sizes.remove(key);
} else {
_sizes[key] = bytes;
}
if (spilled) _spills += 1;
}