Version 0.4.0

Changes:
- put ObservabilityMiddleware before ExceptionHandlerMiddleware to avoid repetative code
- add application startup and last metrics update metrics along with CPU usage metric and threads count
- move host and port to new uvicorn section at config along with new reload and forwarded_allow_ips
- add request_id and remove trace_id/span_id generation if tracing is disabled
- move logging logic from utils to observability
- pass trace_id/span_id in HEX form

{{project_slug}}/observability/otel_agent.py.jinja

@@ -1,10 +1,13 @@
 """Open Telemetry agent initialization is defined here"""
 
+import platform
+from functools import cache
+
 from opentelemetry import metrics, trace
 from opentelemetry.exporter.otlp.proto.http.trace_exporter import OTLPSpanExporter
 from opentelemetry.exporter.prometheus import PrometheusMetricReader
 from opentelemetry.sdk.metrics import MeterProvider
-from opentelemetry.sdk.resources import SERVICE_NAME, SERVICE_VERSION, Resource
+from opentelemetry.sdk.resources import SERVICE_INSTANCE_ID, SERVICE_NAME, SERVICE_VERSION, Resource
 from opentelemetry.sdk.trace import TracerProvider
 from opentelemetry.sdk.trace.export import BatchSpanProcessor
 
@@ -14,14 +17,16 @@ from {{project_slug}}.version import VERSION as APP_VERSION
 from .metrics_server import PrometheusServer
 
 
+@cache
+def get_resource() -> Resource:
+    return Resource.create(
+        attributes={SERVICE_NAME: "{{project_slug}}", SERVICE_VERSION: APP_VERSION, SERVICE_INSTANCE_ID: platform.node()}
+    )
+
+
 class OpenTelemetryAgent:  # pylint: disable=too-few-public-methods
     def __init__(self, prometheus_config: PrometheusConfig | None, jaeger_config: JaegerConfig | None):
-        self._resource = Resource.create(
-            attributes={
-                SERVICE_NAME: "{{project_name}}",
-                SERVICE_VERSION: APP_VERSION,
-            }
-        )
+        self._resource = get_resource()
         self._prometheus: PrometheusServer | None = None
         self._span_exporter: OTLPSpanExporter | None = None