system.memory.usage has no temporality and type being sent

Describe your environment

OS: (e.g, Ubuntu)
Python version: (e.g., Python 3.8.10)
Package version: (e.g., 0.46.0)

What happened?

system.memory.usage has no temporality and type being sent, should it be standardize as the receiver https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/receiver/hostmetricsreceiver/internal/scraper/memoryscraper/documentation.md?

Steps to Reproduce

metric_exporter = OTLPMetricExporter(endpoint="xxx", max_export_batch_size=512)
set_meter_provider(MeterProvider([PeriodicExportingMetricReader(metric_exporter), PeriodicExportingMetricReader(ConsoleMetricExporter())], resource=resource))
SystemMetricsInstrumentor().instrument()

Expected Result

My dashboard expecting those 2 column to be filled.

Actual Result

temporality = 'Unspecified', type = 'Gauge'

Additional context

No response

Would you like to implement a fix?

None

Start with SystemMetricsInstrumentor and the system.memory.usage metric produced by the provided OTLPMetricExporter example. Compare its temporality and type with the hostmetrics receiver memory scraper documentation, then rerun the reproduction and verify both fields are populated as expected.