opentelemetry-java-instrume.../docs/semantic-conventions.md

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# Semantic conventions
This document describes
which [OpenTelemetry Semantic Conventions](https://github.com/open-telemetry/opentelemetry-specification/tree/main/specification/trace/semantic_conventions)
are implemented by Java autoinstrumentation and which ones are not.
## Http Server
| Attribute | Required | Implemented? |
|---------------------------------------------|:--------:|:------------:|
| `http.method` | Y | + |
| `http.url` | N | - [1] |
| `http.target` | N | + [1] |
| `http.host` | N | + [1] |
| `http.scheme` | N | + [1] |
| `http.status_code` | Y | + |
| `http.flavor` | N | + [2] |
| `http.user_agent` | N | + |
| `http.request_content_length` | N | - |
| `http.request_content_length_uncompressed` | N | - |
| `http.response_content_length` | N | - |
| `http.response_content_length_uncompressed` | N | - |
| `http.server_name` | N | - |
| `http.route` | N | - |
| `http.client_ip` | N | + |
**[1]:** Server instrumentations capture `http.scheme`, `http.host`, and `http.target` and do not
capture `http.url`.
**[2]:** In case of Armeria, return values
are [SessionProtocol](https://github.com/line/armeria/blob/master/core/src/main/java/com/linecorp/armeria/common/SessionProtocol.java),
not values defined by spec.
## Http Client
| Attribute | Required | Implemented? |
|---------------------------------------------|:--------:|:------------:|
| `http.method` | Y | + |
| `http.url` | N | + |
| `http.target` | N | - [1] |
| `http.host` | N | - [1] |
| `http.scheme` | N | - [1] |
| `http.status_code` | Y | + |
| `http.flavor` | N | + [2] |
| `http.user_agent` | N | + |
| `http.request_content_length` | N | - |
| `http.request_content_length_uncompressed` | N | - |
| `http.response_content_length` | N | - |
| `http.response_content_length_uncompressed` | N | - |
**[1]:** Client instrumentations capture `http.url` and do not capture `http.scheme`, `http.host`
and `http.target`.
**[2]:** In case of Armeria, return values
are [SessionProtocol](https://github.com/line/armeria/blob/master/core/src/main/java/com/linecorp/armeria/common/SessionProtocol.java),
not values defined by spec.
## RPC
| Attribute | Required | Implemented? |
|---------------|:--------:|:------------:|
| `rpc.system` | Y | + |
| `rpc.service` | N | + |
| `rpc.method` | N | + |
## Database
| Attribute | Required | Implemented? |
|----------------------------|:--------:|:-------------------------------------------------------------:|
| `db.system` | Y | + |
| `db.connection_string` | N | only set for Redis, JDBC and MongoDB |
| `db.user` | N | only set for JDBC |
| `db.jdbc.driver_classname` | N | - |
| `db.mssql.instance_name` | N | - |
| `db.name` | N | only set of JDBC, Mongo, Geode and MongoDB |
| `db.statement` | N | +, except for ElasticSearch and Memcached, see `db.operation` |
| `db.operation` | N | only set for ElasticSearch, Memcached and JDBC |
| `db.cassandra.keyspace` | Y | + |
| `db.hbase` | Y | -, HBase is not supported |
| `db.redis.database_index` | N | only set for Lettuce driver, not for Jedis |
| `db.mongodb.collection` | Y | - |
## Messaging
| Attribute name | Required? | Implemented? |
|---------------------------------------------------|:------------------:|:-------------------------------:|
| `messaging.system` | Y | + |
| `messaging.destination.name` | Y | + |
| `messaging.destination.kind` | Y | + |
| `messaging.destination.temporary` | N | - |
| `net.app.protocol.name` | N | - |
| `net.app.protocol.version` | N | - |
| `messaging.message.id` | N | only for JMS |
| `messaging.message.conversation_id` | N | only for JMS |
| `messaging.message.payload_size_bytes` | N | only for RabbitMQ and Kafka [1] |
| `messaging.message.payload_compressed_size_bytes` | N | - |
| `messaging.operation` | for consumers only | + |
**[1]:** Kafka consumer instrumentation sets this to the serialized size of the value