Prometheus Exporter sanitize info metric

Author: kornerc

exporter/opentelemetry-exporter-prometheus/src/opentelemetry/exporter/prometheus/__init__.py

@@ -378,6 +378,8 @@ def _create_info_metric(
         self, name: str, description: str, attributes: Dict[str, str]
     ) -> InfoMetricFamily:
         """Create an Info Metric Family with list of attributes"""
+        # sanitize the attribute names according to Prometheus rule
+        attributes = {self._sanitize(key): value for key, value in attributes.items()}
         info = InfoMetricFamily(name, description, labels=attributes)
         info.add_metric(labels=list(attributes.keys()), value=attributes)
         return info