Add boot42-otel module: Spring Boot 4.2.0-RC1 OpenTelemetry conventions, shared OTLP settings and MDC keys vs 4.1.2

boot42-otel/output/01-conventions-metrics-and-spans-on-4.1.2.txt

@@ -0,0 +1,37 @@
+# 01-conventions-metrics-and-spans  (Spring Boot 4.1.2, JDK 25)
+
+== management.observations.conventions=(property not set)
+-- meters whose name contains 'http':
+   http.server.requests  [error=none, exception=none, method=GET, outcome=SUCCESS, status=200, uri=/hello/{name}]
+   http.server.requests.active  [exception=none, method=GET, outcome=SUCCESS, status=200, uri=UNKNOWN]
+-- span-related strings in the OTLP trace payload (1 request(s)):
+   /hello/ankurJ
+   /hello/{name}z
+   http get /hello/{name}0
+
+== management.observations.conventions=micrometer
+-- meters whose name contains 'http':
+   http.server.requests  [error=none, exception=none, method=GET, outcome=SUCCESS, status=200, uri=/hello/{name}]
+   http.server.requests.active  [exception=none, method=GET, outcome=SUCCESS, status=200, uri=UNKNOWN]
+-- span-related strings in the OTLP trace payload (1 request(s)):
+   /hello/ankurJ
+   /hello/{name}z
+   http get /hello/{name}0
+
+== management.observations.conventions=open-telemetry
+-- meters whose name contains 'http':
+   http.server.requests  [error=none, exception=none, method=GET, outcome=SUCCESS, status=200, uri=/hello/{name}]
+   http.server.requests.active  [exception=none, method=GET, outcome=SUCCESS, status=200, uri=UNKNOWN]
+-- span-related strings in the OTLP trace payload (1 request(s)):
+   /hello/ankurJ
+   /hello/{name}z
+   http get /hello/{name}0
+
+== management.observations.conventions=opentelemetry
+-- meters whose name contains 'http':
+   http.server.requests  [error=none, exception=none, method=GET, outcome=SUCCESS, status=200, uri=/hello/{name}]
+   http.server.requests.active  [exception=none, method=GET, outcome=SUCCESS, status=200, uri=UNKNOWN]
+-- span-related strings in the OTLP trace payload (1 request(s)):
+   /hello/ankurJ
+   /hello/{name}z
+   http get /hello/{name}0