Category | Item | Limit |
Event bus | Total number of system event buses | Up to one system event bus is allowed. |
Total number of custom event buses | Up to 50 custom event buses are allowed. |
Number of event rules | Up to 50 event rules are allowed. |
Name of an event bus | The name of an event bus can be up to 127 characters in length. The name must start with a letter or a digit, and can contain letters, digits, and hyphens (-). The reserved keyword default cannot be used as the name of an event bus. The name of an event bus cannot be a string that is prefixed with eventbridge-reserved-.
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Number of events in the system event bus | Up to 10,000 events are allowed per second. |
Number of events in a custom event bus | Up to 3,000 events are allowed per second. |
Event rule | Event targets of an event rule | Up to five event targets are allowed. Event targets must reside in the same region as the region where EventBridge is activated. Event targets must be service instances in your Alibaba Cloud account. The ID of an event target must be unique.
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Pattern of an event rule | In the stringExpression pattern, each field can contain up to five expressions in the map data structure. |
Name of an event rule | The name of an event rule can be up to 127 characters in length. The name must start with a letter or a digit, and can contain letters, digits, and hyphens (-). The name of an event rule cannot be a string that is prefixed with eventbridge-reserved-.
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Transformation of event content | template: The value can be up to 10,240 characters in length. value: The value can be up to 10,240 characters in length.
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Event | Event message | An event message cannot exceed 256 KB in size. Up to 16 event messages can be sent in a batch. The total size of event messages that are sent in a batch cannot exceed 1 MB.
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Event field | id: The value can be up to 128 characters in length. It must start with a letter or a digit, and can contain letters, digits, and hyphens (-). source: The value can be up to 128 characters in length. subject: The value can be up to 512 characters in length. type: The value can be up to 64 characters in length.
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Schema | Schema name | The name of a schema can contain only letters, digits, hyphens (-), underscores (_), and periods (.). The name of a schema can be up to 128 characters in length. If the name that you specify is more than 128 characters in length, the system automatically truncates the value.
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Number of schema versions | Up to 1,000 schema versions are allowed. |
Event stream | Event stream name | The name of an event stream must start with a letter or a digit, and can contain letters, digits, and hyphens (-). The name of an event stream can be up to 127 characters in length. If the name that you specify is more than 127 characters in length, the system automatically truncates the value.
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Number of event streams | By default, up to 50 event streams are allowed. If you require more than 50 event streams, apply for a quota increase in Quota Center. The event stream quota that you can apply for ranges from 51 to 10,000. For more information, see Submit an application to increase a quota. |
Pattern of an event rule | In the stringExpression pattern, each field can contain up to five expressions in the map data structure. |
Transformation of event content | template: The value can be up to 10,240 characters in length. value: The value can be up to 10,240 characters in length.
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Event source | Name of an event source | The name of an event source can contain letters, digits, hyphens (-), and periods (.). The name of an event source can be up to 127 characters in length. If the name that you specify is more than 127 characters in length, the system automatically truncates the value.
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