[jira] [Created] (CAMEL-23584) camel-kafka - align Exchange header constant names with Camel naming convention

["Andrea Cosentino (Jira)" <ji...@apache.org>]

Andrea Cosentino created CAMEL-23584:
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             Summary: camel-kafka - align Exchange header constant names with Camel naming convention
                 Key: CAMEL-23584
                 URL: https://issues.apache.org/jira/browse/CAMEL-23584
             Project: Camel
          Issue Type: Improvement
          Components: camel-kafka
            Reporter: Andrea Cosentino
            Assignee: Andrea Cosentino
             Fix For: 4.21.0


{{KafkaConstants}} exposes producer-read headers with dotted lowercase values:

* {{OVERRIDE_TOPIC = "kafka.OVERRIDE_TOPIC"}} - reroutes producer messages to a different topic
* {{OVERRIDE_TIMESTAMP = "kafka.OVERRIDE_TIMESTAMP"}} - overrides record timestamp
* {{KEY = "kafka.KEY"}} - record key (partitioning input)
* {{PARTITION_KEY = "kafka.PARTITION_KEY"}} - explicit partition
* Consumer-set (also defined): {{TOPIC}}, {{PARTITION}}, {{OFFSET}}

Rename to {{CamelKafka<Name>}}; widely used in the Camel ecosystem so the upgrade-guide entry must be prominent.

h3. Fix shape

Rename the *string value* of each producer-read header constant to {{Camel<Component><Name>}}; keep the Java field name unchanged so routes that reference the constants symbolically continue to compile and run. Update tests that use the literal string values; regenerate component catalog JSON and docs; add an upgrade-guide entry in {{camel-4x-upgrade-guide-4_21.adoc}} (and matching 4_18 / 4_14 for backports where the component existed in those branches).

h3. References

* Tracker: CAMEL-23577
* Precedent (rename pattern): CAMEL-23526 (camel-cxf)
* Alternative pattern (HeaderFilterStrategy approach): CAMEL-23532 (camel-vertx-websocket / camel-atmosphere-websocket / camel-iggy)




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