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

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+# 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

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

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+# 01-conventions-metrics-and-spans  (Spring Boot 4.2.0-RC1, 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}]
+-- 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}]
+-- 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
+-- application FAILED to start
+   NoSuchBeanDefinitionException: No qualifying bean of type 'org.springframework.http.server.observation.ServerRequestObservationConvention' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}
+
+== management.observations.conventions=opentelemetry
+-- meters whose name contains 'http':
+   http.server.request.duration  [error.type=none, error=none, http.request.method=GET, http.response.status_code=200, http.route=/hello/{name}, outcome=SUCCESS, url.scheme=http]
+-- span-related strings in the OTLP trace payload (1 request(s)):
+   /hello/ankurJ
+   /hello/{name}J
+   GET /hello/{name}0

boot42-otel/output/02-shared-otlp-endpoint-on-4.1.2.txt

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+# 02-shared-otlp-endpoint  (Spring Boot 4.1.2, JDK 25)
+management.opentelemetry.otlp.endpoint    = <sink>   (one property, no per-signal URLs)
+management.opentelemetry.otlp.headers     = Authorization: Bearer shared-token
+management.opentelemetry.otlp.compression = gzip
+
+requests that reached the sink:
+  (none: 4.1.2 ignores the shared properties and exports to its default localhost:4318)

boot42-otel/output/02-shared-otlp-endpoint.txt

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+# 02-shared-otlp-endpoint  (Spring Boot 4.2.0-RC1, JDK 25)
+management.opentelemetry.otlp.endpoint    = <sink>   (one property, no per-signal URLs)
+management.opentelemetry.otlp.headers     = Authorization: Bearer shared-token
+management.opentelemetry.otlp.compression = gzip
+
+requests that reached the sink:
+  POST /v1/metrics  Authorization=Bearer shared-token  Content-Encoding=gzip
+  POST /v1/traces   Authorization=Bearer shared-token  Content-Encoding=gzip

boot42-otel/output/03-signal-specific-overrides-shared-on-4.1.2.txt

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+# 03-signal-specific-overrides-shared  (Spring Boot 4.1.2, JDK 25)
+shared endpoint                          = <sink>
+tracing.export.otlp.endpoint             = <sink>/custom/spans
+shared header Authorization              = Bearer shared-token
+shared header X-Shared                   = shared-only
+tracing.export.otlp.headers.Authorization = Bearer traces-token
+
+requests that reached the sink:
+  POST /custom/spans  Authorization=Bearer traces-token  X-Shared=null

boot42-otel/output/03-signal-specific-overrides-shared.txt

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+# 03-signal-specific-overrides-shared  (Spring Boot 4.2.0-RC1, JDK 25)
+shared endpoint                          = <sink>
+tracing.export.otlp.endpoint             = <sink>/custom/spans
+shared header Authorization              = Bearer shared-token
+shared header X-Shared                   = shared-only
+tracing.export.otlp.headers.Authorization = Bearer traces-token
+
+requests that reached the sink:
+  POST /custom/spans  Authorization=Bearer traces-token  X-Shared=shared-only
+  POST /v1/metrics    Authorization=Bearer shared-token  X-Shared=shared-only

boot42-otel/output/04-mdc-keys-on-4.1.2.txt

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+# 04-mdc-keys  (Spring Boot 4.1.2, JDK 25)
+management.tracing.mdc.trace-id-key = trace_id
+management.tracing.mdc.span-id-key  = span_id
+log pattern correlation part reads both MDC keys
+
+log line: INFO 4192 --- [boot42-otel] [o-auto-1-exec-1] default[<32-hex-trace-id>] custom[] c.a.o.OtelApplication$HelloController    : handling hello for ankur
+default key traceId populated: true
+custom key trace_id populated: false

boot42-otel/output/04-mdc-keys.txt

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+# 04-mdc-keys  (Spring Boot 4.2.0-RC1, JDK 25)
+management.tracing.mdc.trace-id-key = trace_id
+management.tracing.mdc.span-id-key  = span_id
+log pattern correlation part reads both MDC keys
+
+log line: INFO 3810 --- [boot42-otel] [o-auto-1-exec-1] default[] custom[<32-hex-trace-id>] c.a.o.OtelApplication$HelloController    : handling hello for ankur
+default key traceId populated: false
+custom key trace_id populated: true

boot42-otel/output/05-active-long-task-timer-on-4.1.2.txt

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+# 05-active-long-task-timer  (Spring Boot 4.1.2, JDK 25)
+
+== (default)
+   http.server.requests  (TIMER)
+   http.server.requests.active  (LONG_TASK_TIMER)
+   http.server.requests.active present: true
+
+== management.metrics.observations.include-active-long-task-timer=true
+   http.server.requests  (TIMER)
+   http.server.requests.active  (LONG_TASK_TIMER)
+   http.server.requests.active present: true

boot42-otel/output/05-active-long-task-timer.txt

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+# 05-active-long-task-timer  (Spring Boot 4.2.0-RC1, JDK 25)
+
+== (default)
+   http.server.requests  (TIMER)
+   http.server.requests.active present: false
+
+== management.metrics.observations.include-active-long-task-timer=true
+   http.server.requests  (TIMER)
+   http.server.requests.active  (LONG_TASK_TIMER)
+   http.server.requests.active present: true

boot42-otel/output/06-prometheus-names-on-4.1.2.txt

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+# 06-prometheus-names  (Spring Boot 4.1.2, JDK 25)
+
+== management.observations.conventions=micrometer
+   http_server_requests_active_seconds_count
+   http_server_requests_active_seconds_max
+   http_server_requests_active_seconds_sum
+   http_server_requests_seconds_count
+   http_server_requests_seconds_max
+   http_server_requests_seconds_sum
+   sample: http_server_requests_active_seconds_count{exception="none",method="GET",outcome="SUCCESS",status="200",uri="UNKNOWN"}
+
+== management.observations.conventions=opentelemetry
+   http_server_requests_active_seconds_count
+   http_server_requests_active_seconds_max
+   http_server_requests_active_seconds_sum
+   http_server_requests_seconds_count
+   http_server_requests_seconds_max
+   http_server_requests_seconds_sum
+   sample: http_server_requests_active_seconds_count{exception="none",method="GET",outcome="SUCCESS",status="200",uri="UNKNOWN"}

boot42-otel/output/06-prometheus-names.txt

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+# 06-prometheus-names  (Spring Boot 4.2.0-RC1, JDK 25)
+
+== management.observations.conventions=micrometer
+   http_server_requests_seconds_count
+   http_server_requests_seconds_max
+   http_server_requests_seconds_sum
+   sample: http_server_requests_seconds_count{error="none",exception="none",method="GET",outcome="SUCCESS",status="200",uri="/hello/{name}"}
+
+== management.observations.conventions=opentelemetry
+   http_server_request_duration_seconds_count
+   http_server_request_duration_seconds_max
+   http_server_request_duration_seconds_sum
+   sample: http_server_request_duration_seconds_count{error="none",error_type="none",http_request_method="GET",http_response_status_code="200",http_route="/hello/{name}",outcome="SUCCESS",url_scheme="http"}

boot42-otel/output/07-conventions-spellings-on-4.1.2.txt

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+# 07-conventions-spellings  (Spring Boot 4.1.2, JDK 25)
+open-telemetry   -> starts, server meter: [http.server.requests]
+open_telemetry   -> starts, server meter: [http.server.requests]
+OPEN_TELEMETRY   -> starts, server meter: [http.server.requests]
+opentelemetry    -> starts, server meter: [http.server.requests]
+openTelemetry    -> starts, server meter: [http.server.requests]
+micrometer       -> starts, server meter: [http.server.requests]
+MICROMETER       -> starts, server meter: [http.server.requests]

boot42-otel/output/07-conventions-spellings.txt

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+# 07-conventions-spellings  (Spring Boot 4.2.0-RC1, JDK 25)
+open-telemetry   -> FAILS to start
+open_telemetry   -> starts, server meter: [http.server.request.duration]
+OPEN_TELEMETRY   -> starts, server meter: [http.server.request.duration]
+opentelemetry    -> starts, server meter: [http.server.request.duration]
+openTelemetry    -> starts, server meter: [http.server.request.duration]
+micrometer       -> starts, server meter: [http.server.requests]
+MICROMETER       -> starts, server meter: [http.server.requests]