Support of host.name in OTEL metrics and usage of OTEL_RESOURCE_ATTRIBUTES in metrics (apache#42428)

* fixes: 42425, and 42424

* fixed static type check failure

Author: howardyoo

airflow/metrics/otel_logger.py

@@ -28,7 +28,7 @@
 from opentelemetry.metrics import Observation
 from opentelemetry.sdk.metrics import MeterProvider
 from opentelemetry.sdk.metrics._internal.export import ConsoleMetricExporter, PeriodicExportingMetricReader
-from opentelemetry.sdk.resources import SERVICE_NAME, Resource
+from opentelemetry.sdk.resources import HOST_NAME, SERVICE_NAME, Resource
 
 from airflow.configuration import conf
 from airflow.exceptions import AirflowProviderDeprecationWarning
@@ -40,6 +40,7 @@
     get_validator,
     stat_name_otel_handler,
 )
+from airflow.utils.net import get_hostname
 
 if TYPE_CHECKING:
     from opentelemetry.metrics import Instrument
@@ -410,7 +411,7 @@ def get_otel_logger(cls) -> SafeOtelLogger:
     debug = conf.getboolean("metrics", "otel_debugging_on")
     service_name = conf.get("metrics", "otel_service")
 
-    resource = Resource(attributes={SERVICE_NAME: service_name})
+    resource = Resource.create(attributes={HOST_NAME: get_hostname(), SERVICE_NAME: service_name})
 
     protocol = "https" if ssl_active else "http"
     endpoint = f"{protocol}://{host}:{port}/v1/metrics"