initial jaeger integration (#2047)

Co-authored-by: Pierre Krieger <pierre.krieger1708@gmail.com>
Co-authored-by: Peter Goodspeed-Niklaus <coriolinus@users.noreply.github.com>
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

polkadot/node/subsystem/src/errors.rs

@@ -59,3 +59,21 @@ impl core::fmt::Display for ChainApiError {
 }
 
 impl std::error::Error for ChainApiError {}
+
+
+/// A description of an error causing the chain API request to be unservable.
+#[derive(Debug, thiserror::Error)]
+#[allow(missing_docs)]
+pub enum JaegerError {
+	#[error("Already launched the collector thread")]
+	AlreadyLaunched,
+
+	#[error("Missing jaeger configuration")]
+	MissingConfiguration,
+
+	#[error("Failed to allocate port for UDP transfer to jaeger agent")]
+	PortAllocationError(#[source] std::io::Error),
+
+	#[error("Failed to send jaeger span to agent")]
+	SendError(#[source] std::io::Error),
+}