otel: Explicitly initialize telemetry provider and tracer

Doing this setup on import is simple, but it has issues if the pungi
code is directly imported into a different process.

Specifically, ODCS may have created its own provider and set things up
as needed, and then imports pungi, which tries to set a new provider.
This is prohibited by the SDK docs, and emits a warning. In reality it
is causing spans to be attributed to a wrong service.

As a side effect, RequestsIntrumentor doesn't start, and so the parent
process will need to do that on its own instead of relying on the side
effect.

Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>
(cherry picked from commit e0a3343a4be96f9e284b752e5c5f31e02883a0a8)

pungi/otel.py

@@ -12,6 +12,9 @@ depending on whether environment variables configuring OTel are configured.
 class DummyTracing:
     """A dummy tracing module that doesn't actually do anything."""
 
+    def setup(self):
+        pass
+
     @contextmanager
     def span(self, *args, **kwargs):
         yield
@@ -38,7 +41,11 @@ class DummyTracing:
 class OtelTracing:
     """This class implements the actual integration with opentelemetry."""
 
-    def __init__(self):
+    def setup(self):
+        """Configure opentelemetry tracing based on environment variables. This
+        setup is optional as it may not be desirable when pungi is used as a
+        library.
+        """
         from opentelemetry import trace
         from opentelemetry.sdk.resources import Resource
         from opentelemetry.sdk.trace import TracerProvider
@@ -61,7 +68,6 @@ class OtelTracing:
             self.processor = BatchSpanProcessor(OTLPSpanExporter())
         provider.add_span_processor(self.processor)
         trace.set_tracer_provider(provider)
-        self.tracer = trace.get_tracer(__name__)
 
         traceparent = os.environ.get("TRACEPARENT")
         if traceparent:
@@ -74,6 +80,12 @@ class OtelTracing:
         except ImportError:
             pass
 
+    @property
+    def tracer(self):
+        from opentelemetry import trace
+
+        return trace.get_tracer(__name__)
+
     @contextmanager
     def span(self, name, **attributes):
         """Create a new span as a child of the current one. Attributes can be

pungi/scripts/pungi_koji.py

@@ -653,6 +653,8 @@ def cli_main():
     signal.signal(signal.SIGINT, sigterm_handler)
     signal.signal(signal.SIGTERM, sigterm_handler)
 
+    tracing.setup()
+
     with tracing.span("run-compose"):
         try:
             main()