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# Messaging

- [General Messaging Attributes](#general-messaging-attributes)
- [Azure Event Hubs Attributes](#azure-event-hubs-attributes)
- [GCP Pub/Sub Attributes](#gcp-pubsub-attributes)
- [Kafka Attributes](#kafka-attributes)
- [RabbitMQ Attributes](#rabbitmq-attributes)
- [RocketMQ Attributes](#rocketmq-attributes)
- [Azure Service Bus Attributes](#azure-service-bus-attributes)
- [Deprecated Messaging Attributes](#deprecated-messaging-attributes)

## General Messaging Attributes

Attributes describing telemetry around messaging systems and messaging activities.

| Attribute | Type | Description | Examples | Stability |
|---|---|---|---|---|
| <a id="messaging-batch-message-count" href="#messaging-batch-message-count">`messaging.batch.message_count`</a> | int | The number of messages sent, received, or processed in the scope of the batching operation. [1] | `0`; `1`; `2` | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-client-id" href="#messaging-client-id">`messaging.client.id`</a> | string | A unique identifier for the client that consumes or produces a message. | `client-5`; `myhost@8742@s8083jm` | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-consumer-group-name" href="#messaging-consumer-group-name">`messaging.consumer.group.name`</a> | string | The name of the consumer group with which a consumer is associated. [2] | `my-group`; `indexer` | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-destination-anonymous" href="#messaging-destination-anonymous">`messaging.destination.anonymous`</a> | boolean | A boolean that is true if the message destination is anonymous (could be unnamed or have auto-generated name). |  | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-destination-name" href="#messaging-destination-name">`messaging.destination.name`</a> | string | The message destination name [3] | `MyQueue`; `MyTopic` | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-destination-partition-id" href="#messaging-destination-partition-id">`messaging.destination.partition.id`</a> | string | The identifier of the partition messages are sent to or received from, unique within the `messaging.destination.name`. | `1` | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-destination-subscription-name" href="#messaging-destination-subscription-name">`messaging.destination.subscription.name`</a> | string | The name of the destination subscription from which a message is consumed. [4] | `subscription-a` | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-destination-template" href="#messaging-destination-template">`messaging.destination.template`</a> | string | Low cardinality representation of the messaging destination name [5] | `/customers/{customerId}` | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-destination-temporary" href="#messaging-destination-temporary">`messaging.destination.temporary`</a> | boolean | A boolean that is true if the message destination is temporary and might not exist anymore after messages are processed. |  | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-message-body-size" href="#messaging-message-body-size">`messaging.message.body.size`</a> | int | The size of the message body in bytes. [6] | `1439` | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-message-conversation-id" href="#messaging-message-conversation-id">`messaging.message.conversation_id`</a> | string | The conversation ID identifying the conversation to which the message belongs, represented as a string. Sometimes called "Correlation ID". | `MyConversationId` | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-message-envelope-size" href="#messaging-message-envelope-size">`messaging.message.envelope.size`</a> | int | The size of the message body and metadata in bytes. [7] | `2738` | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-message-id" href="#messaging-message-id">`messaging.message.id`</a> | string | A value used by the messaging system as an identifier for the message, represented as a string. | `452a7c7c7c7048c2f887f61572b18fc2` | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-operation-name" href="#messaging-operation-name">`messaging.operation.name`</a> | string | The system-specific name of the messaging operation. | `ack`; `nack`; `send` | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-operation-type" href="#messaging-operation-type">`messaging.operation.type`</a> | string | A string identifying the type of the messaging operation. [8] | `create`; `send`; `receive` | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-system" href="#messaging-system">`messaging.system`</a> | string | The messaging system as identified by the client instrumentation. [9] | `activemq`; `aws_sqs`; `eventgrid` | ![Development](https://img.shields.io/badge/-development-blue) |

**[1] `messaging.batch.message_count`:** Instrumentations SHOULD NOT set `messaging.batch.message_count` on spans that operate with a single message. When a messaging client library supports both batch and single-message API for the same operation, instrumentations SHOULD use `messaging.batch.message_count` for batching APIs and SHOULD NOT use it for single-message APIs.

**[2] `messaging.consumer.group.name`:** Semantic conventions for individual messaging systems SHOULD document whether `messaging.consumer.group.name` is applicable and what it means in the context of that system.

**[3] `messaging.destination.name`:** Destination name SHOULD uniquely identify a specific queue, topic or other entity within the broker. If
the broker doesn't have such notion, the destination name SHOULD uniquely identify the broker.

**[4] `messaging.destination.subscription.name`:** Semantic conventions for individual messaging systems SHOULD document whether `messaging.destination.subscription.name` is applicable and what it means in the context of that system.

**[5] `messaging.destination.template`:** Destination names could be constructed from templates. An example would be a destination name involving a user name or product id. Although the destination name in this case is of high cardinality, the underlying template is of low cardinality and can be effectively used for grouping and aggregation.

**[6] `messaging.message.body.size`:** This can refer to both the compressed or uncompressed body size. If both sizes are known, the uncompressed
body size should be used.

**[7] `messaging.message.envelope.size`:** This can refer to both the compressed or uncompressed size. If both sizes are known, the uncompressed
size should be used.

**[8] `messaging.operation.type`:** If a custom value is used, it MUST be of low cardinality.

**[9] `messaging.system`:** The actual messaging system may differ from the one known by the client. For example, when using Kafka client libraries to communicate with Azure Event Hubs, the `messaging.system` is set to `kafka` based on the instrumentation's best knowledge.

---

`messaging.operation.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `create` | A message is created. "Create" spans always refer to a single message and are used to provide a unique creation context for messages in batch sending scenarios. | ![Development](https://img.shields.io/badge/-development-blue) |
| `process` | One or more messages are processed by a consumer. | ![Development](https://img.shields.io/badge/-development-blue) |
| `receive` | One or more messages are requested by a consumer. This operation refers to pull-based scenarios, where consumers explicitly call methods of messaging SDKs to receive messages. | ![Development](https://img.shields.io/badge/-development-blue) |
| `send` | One or more messages are provided for sending to an intermediary. If a single message is sent, the context of the "Send" span can be used as the creation context and no "Create" span needs to be created. | ![Development](https://img.shields.io/badge/-development-blue) |
| `settle` | One or more messages are settled. | ![Development](https://img.shields.io/badge/-development-blue) |

---

`messaging.system` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `activemq` | Apache ActiveMQ | ![Development](https://img.shields.io/badge/-development-blue) |
| `aws_sqs` | Amazon Simple Queue Service (SQS) | ![Development](https://img.shields.io/badge/-development-blue) |
| `eventgrid` | Azure Event Grid | ![Development](https://img.shields.io/badge/-development-blue) |
| `eventhubs` | Azure Event Hubs | ![Development](https://img.shields.io/badge/-development-blue) |
| `gcp_pubsub` | Google Cloud Pub/Sub | ![Development](https://img.shields.io/badge/-development-blue) |
| `jms` | Java Message Service | ![Development](https://img.shields.io/badge/-development-blue) |
| `kafka` | Apache Kafka | ![Development](https://img.shields.io/badge/-development-blue) |
| `pulsar` | Apache Pulsar | ![Development](https://img.shields.io/badge/-development-blue) |
| `rabbitmq` | RabbitMQ | ![Development](https://img.shields.io/badge/-development-blue) |
| `rocketmq` | Apache RocketMQ | ![Development](https://img.shields.io/badge/-development-blue) |
| `servicebus` | Azure Service Bus | ![Development](https://img.shields.io/badge/-development-blue) |

## Azure Event Hubs Attributes

This group describes attributes specific to Azure Event Hubs.

| Attribute | Type | Description | Examples | Stability |
|---|---|---|---|---|
| <a id="messaging-eventhubs-message-enqueued-time" href="#messaging-eventhubs-message-enqueued-time">`messaging.eventhubs.message.enqueued_time`</a> | int | The UTC epoch seconds at which the message has been accepted and stored in the entity. | `1701393730` | ![Development](https://img.shields.io/badge/-development-blue) |

## GCP Pub/Sub Attributes

This group describes attributes specific to GCP Pub/Sub.

| Attribute | Type | Description | Examples | Stability |
|---|---|---|---|---|
| <a id="messaging-gcp-pubsub-message-ack-deadline" href="#messaging-gcp-pubsub-message-ack-deadline">`messaging.gcp_pubsub.message.ack_deadline`</a> | int | The ack deadline in seconds set for the modify ack deadline request. | `10` | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-gcp-pubsub-message-ack-id" href="#messaging-gcp-pubsub-message-ack-id">`messaging.gcp_pubsub.message.ack_id`</a> | string | The ack id for a given message. | `ack_id` | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-gcp-pubsub-message-delivery-attempt" href="#messaging-gcp-pubsub-message-delivery-attempt">`messaging.gcp_pubsub.message.delivery_attempt`</a> | int | The delivery attempt for a given message. | `2` | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-gcp-pubsub-message-ordering-key" href="#messaging-gcp-pubsub-message-ordering-key">`messaging.gcp_pubsub.message.ordering_key`</a> | string | The ordering key for a given message. If the attribute is not present, the message does not have an ordering key. | `ordering_key` | ![Development](https://img.shields.io/badge/-development-blue) |

## Kafka Attributes

This group describes attributes specific to Apache Kafka.

| Attribute | Type | Description | Examples | Stability |
|---|---|---|---|---|
| <a id="messaging-kafka-message-key" href="#messaging-kafka-message-key">`messaging.kafka.message.key`</a> | string | Message keys in Kafka are used for grouping alike messages to ensure they're processed on the same partition. They differ from `messaging.message.id` in that they're not unique. If the key is `null`, the attribute MUST NOT be set. [10] | `myKey` | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-kafka-message-tombstone" href="#messaging-kafka-message-tombstone">`messaging.kafka.message.tombstone`</a> | boolean | A boolean that is true if the message is a tombstone. |  | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-kafka-offset" href="#messaging-kafka-offset">`messaging.kafka.offset`</a> | int | The offset of a record in the corresponding Kafka partition. | `42` | ![Development](https://img.shields.io/badge/-development-blue) |

**[10] `messaging.kafka.message.key`:** If the key type is not string, it's string representation has to be supplied for the attribute. If the key has no unambiguous, canonical string form, don't include its value.

## RabbitMQ Attributes

This group describes attributes specific to RabbitMQ.

| Attribute | Type | Description | Examples | Stability |
|---|---|---|---|---|
| <a id="messaging-rabbitmq-destination-routing-key" href="#messaging-rabbitmq-destination-routing-key">`messaging.rabbitmq.destination.routing_key`</a> | string | RabbitMQ message routing key. | `myKey` | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-rabbitmq-message-delivery-tag" href="#messaging-rabbitmq-message-delivery-tag">`messaging.rabbitmq.message.delivery_tag`</a> | int | RabbitMQ message delivery tag | `123` | ![Development](https://img.shields.io/badge/-development-blue) |

## RocketMQ Attributes

This group describes attributes specific to RocketMQ.

| Attribute | Type | Description | Examples | Stability |
|---|---|---|---|---|
| <a id="messaging-rocketmq-consumption-model" href="#messaging-rocketmq-consumption-model">`messaging.rocketmq.consumption_model`</a> | string | Model of message consumption. This only applies to consumer spans. | `clustering`; `broadcasting` | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-rocketmq-message-delay-time-level" href="#messaging-rocketmq-message-delay-time-level">`messaging.rocketmq.message.delay_time_level`</a> | int | The delay time level for delay message, which determines the message delay time. | `3` | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-rocketmq-message-delivery-timestamp" href="#messaging-rocketmq-message-delivery-timestamp">`messaging.rocketmq.message.delivery_timestamp`</a> | int | The timestamp in milliseconds that the delay message is expected to be delivered to consumer. | `1665987217045` | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-rocketmq-message-group" href="#messaging-rocketmq-message-group">`messaging.rocketmq.message.group`</a> | string | It is essential for FIFO message. Messages that belong to the same message group are always processed one by one within the same consumer group. | `myMessageGroup` | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-rocketmq-message-keys" href="#messaging-rocketmq-message-keys">`messaging.rocketmq.message.keys`</a> | string[] | Key(s) of message, another way to mark message besides message id. | `["keyA", "keyB"]` | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-rocketmq-message-tag" href="#messaging-rocketmq-message-tag">`messaging.rocketmq.message.tag`</a> | string | The secondary classifier of message besides topic. | `tagA` | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-rocketmq-message-type" href="#messaging-rocketmq-message-type">`messaging.rocketmq.message.type`</a> | string | Type of message. | `normal`; `fifo`; `delay` | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-rocketmq-namespace" href="#messaging-rocketmq-namespace">`messaging.rocketmq.namespace`</a> | string | Namespace of RocketMQ resources, resources in different namespaces are individual. | `myNamespace` | ![Development](https://img.shields.io/badge/-development-blue) |

---

`messaging.rocketmq.consumption_model` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `broadcasting` | Broadcasting consumption model | ![Development](https://img.shields.io/badge/-development-blue) |
| `clustering` | Clustering consumption model | ![Development](https://img.shields.io/badge/-development-blue) |

---

`messaging.rocketmq.message.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `delay` | Delay message | ![Development](https://img.shields.io/badge/-development-blue) |
| `fifo` | FIFO message | ![Development](https://img.shields.io/badge/-development-blue) |
| `normal` | Normal message | ![Development](https://img.shields.io/badge/-development-blue) |
| `transaction` | Transaction message | ![Development](https://img.shields.io/badge/-development-blue) |

## Azure Service Bus Attributes

This group describes attributes specific to Azure Service Bus.

| Attribute | Type | Description | Examples | Stability |
|---|---|---|---|---|
| <a id="messaging-servicebus-disposition-status" href="#messaging-servicebus-disposition-status">`messaging.servicebus.disposition_status`</a> | string | Describes the [settlement type](https://learn.microsoft.com/azure/service-bus-messaging/message-transfers-locks-settlement#peeklock). | `complete`; `abandon`; `dead_letter` | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-servicebus-message-delivery-count" href="#messaging-servicebus-message-delivery-count">`messaging.servicebus.message.delivery_count`</a> | int | Number of deliveries that have been attempted for this message. | `2` | ![Development](https://img.shields.io/badge/-development-blue) |
| <a id="messaging-servicebus-message-enqueued-time" href="#messaging-servicebus-message-enqueued-time">`messaging.servicebus.message.enqueued_time`</a> | int | The UTC epoch seconds at which the message has been accepted and stored in the entity. | `1701393730` | ![Development](https://img.shields.io/badge/-development-blue) |

---

`messaging.servicebus.disposition_status` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `abandon` | Message is abandoned | ![Development](https://img.shields.io/badge/-development-blue) |
| `complete` | Message is completed | ![Development](https://img.shields.io/badge/-development-blue) |
| `dead_letter` | Message is sent to dead letter queue | ![Development](https://img.shields.io/badge/-development-blue) |
| `defer` | Message is deferred | ![Development](https://img.shields.io/badge/-development-blue) |

## Deprecated Messaging Attributes

Describes deprecated messaging attributes.

| Attribute | Type | Description | Examples | Stability |
|---|---|---|---|---|
| <a id="messaging-client-id" href="#messaging-client-id">`messaging.client_id`</a> | string | Deprecated, use `messaging.client.id` instead. | `client-5`; `myhost@8742@s8083jm` | ![Deprecated](https://img.shields.io/badge/-deprecated-red)<br>Replaced by `messaging.client.id`. |
| <a id="messaging-destination-publish-anonymous" href="#messaging-destination-publish-anonymous">`messaging.destination_publish.anonymous`</a> | boolean | Deprecated, no replacement at this time. |  | ![Deprecated](https://img.shields.io/badge/-deprecated-red)<br>No replacement at this time. |
| <a id="messaging-destination-publish-name" href="#messaging-destination-publish-name">`messaging.destination_publish.name`</a> | string | Deprecated, no replacement at this time. | `MyQueue`; `MyTopic` | ![Deprecated](https://img.shields.io/badge/-deprecated-red)<br>No replacement at this time. |
| <a id="messaging-eventhubs-consumer-group" href="#messaging-eventhubs-consumer-group">`messaging.eventhubs.consumer.group`</a> | string | Deprecated, use `messaging.consumer.group.name` instead. | `$Default` | ![Deprecated](https://img.shields.io/badge/-deprecated-red)<br>Replaced by `messaging.consumer.group.name`. |
| <a id="messaging-kafka-consumer-group" href="#messaging-kafka-consumer-group">`messaging.kafka.consumer.group`</a> | string | Deprecated, use `messaging.consumer.group.name` instead. | `my-group` | ![Deprecated](https://img.shields.io/badge/-deprecated-red)<br>Replaced by `messaging.consumer.group.name`. |
| <a id="messaging-kafka-destination-partition" href="#messaging-kafka-destination-partition">`messaging.kafka.destination.partition`</a> | int | Deprecated, use `messaging.destination.partition.id` instead. | `2` | ![Deprecated](https://img.shields.io/badge/-deprecated-red)<br>Replaced by `messaging.destination.partition.id`. |
| <a id="messaging-kafka-message-offset" href="#messaging-kafka-message-offset">`messaging.kafka.message.offset`</a> | int | Deprecated, use `messaging.kafka.offset` instead. | `42` | ![Deprecated](https://img.shields.io/badge/-deprecated-red)<br>Replaced by `messaging.kafka.offset`. |
| <a id="messaging-operation" href="#messaging-operation">`messaging.operation`</a> | string | Deprecated, use `messaging.operation.type` instead. | `publish`; `create`; `process` | ![Deprecated](https://img.shields.io/badge/-deprecated-red)<br>Replaced by `messaging.operation.type`. |
| <a id="messaging-rocketmq-client-group" href="#messaging-rocketmq-client-group">`messaging.rocketmq.client_group`</a> | string | Deprecated, use `messaging.consumer.group.name` instead. | `myConsumerGroup` | ![Deprecated](https://img.shields.io/badge/-deprecated-red)<br>Replaced by `messaging.consumer.group.name` on the consumer spans. No replacement for producer spans. |
| <a id="messaging-servicebus-destination-subscription-name" href="#messaging-servicebus-destination-subscription-name">`messaging.servicebus.destination.subscription_name`</a> | string | Deprecated, use `messaging.destination.subscription.name` instead. | `subscription-a` | ![Deprecated](https://img.shields.io/badge/-deprecated-red)<br>Replaced by `messaging.destination.subscription.name`. |
