# Data Stream limits [Data Stream](/en/documentation/platform/data-stream/) applies default limits to how a stream batches and delivers log lines, to the fields of a stream, and to the usage each plan includes every month. Azion can raise a default limit based on your plan. To request an increase, contact the [technical support](/en/documentation/support/) team. --- ## Default limits Every value in this table applies to each stream or to the account that holds it. The API answers a request past a field bound with `400` and an `errors` array, and creates nothing. | Scope | Limit | Past the limit | | ------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | Batch of log lines | 2,000 records or 60 seconds, whichever comes first. A record is one log line. For *Standard HTTP/HTTPS POST*, the batch also closes at **Payload Max Size**, in bytes. | The stream sends the batch to the endpoint. A stream with little traffic sends small batches. | | Batch of log lines for *AWS Kinesis Data Firehose* | 500 records or 60 seconds, whichever comes first | The stream sends the batch to the endpoint. | | **Payload Max Size**, `outputs[0].attributes.max_size` on a `standard` endpoint | 1,000,000 bytes or more. The Console fills in `1000000`. | A value below `1000000` is refused with `10050` `Min Value`. | | Send timeout for an HTTP POST endpoint | 20 seconds | When the endpoint passes the availability check but does not receive the batch within 20 seconds, the send ends with status `504`. | | Endpoint availability check | Once a minute. Every Azion server must report the endpoint available. | While the endpoint is unavailable, Data Stream does not send to it and discards the logs of that interval. Real-Time Events records the attempt with status `503`. The check runs again the next minute. | | Endpoints per stream | 1 | A second entry in `outputs` is dropped without an error. The API answers `201` and keeps the first entry. | | Active streams while one of them uses sampling | 1 | Saving an active stream with a `sampling` item deactivates every other stream on the account, with no API error. A rate of `100` counts as sampling. The Console warns before saving. | | Stream `name` | 1 to 100 characters | A longer name is refused with `10046` `Max Length`. | | Sampling rate, `transform[sampling].attributes.rate` | 1 to 100, an integer percentage | `0` is refused with `10050` `Min Value`, and `101` with `10068` `Max Value`. | | Workload filter, `transform[filter_workloads].attributes.workloads` | 1 to 600 workload IDs, each a workload on the account | A list outside the range is refused. An ID that is not a workload on the account is refused with `32003` `Workloads Not Belong Account`. | | Workloads on the account, for Azion Console | Fewer than 3,000 | At 3,000 workloads or more, the Console blocks the create and edit forms, and the account manages its streams through the API only. | A change of active state takes effect after one to two minutes, and during that window the previously active stream keeps sending. To run several streams at once, give each one a `filter_workloads` item instead of sampling. For the error codes and their fixes, refer to [Stream settings](/en/documentation/platform/data-stream/stream-settings/#errors). Further bounds apply: - Delivery of the logs to your infrastructure takes up to 3 minutes. - On a `standard` endpoint, `payload_format` takes up to 250 characters, `log_line_separator` up to 100, and `max_size` up to 2,147,483,647 bytes. - The Console accepts up to five **Custom Headers** on a *Standard HTTP/HTTPS POST* endpoint. - A template's `data_set` takes up to 65,535 characters, and its `name` up to 100. - An *AWS Kinesis Data Firehose* `stream_name` takes up to 64 characters. - An *Apache Kafka* `kafka_topic` and `bootstrap_servers`, and an S3 `bucket_name`, each take up to 150 characters. For the bounds of every endpoint field, refer to [Endpoints](/en/documentation/platform/data-stream/endpoints/). --- ## Included usage per plan Data Stream is billed on two metrics: Requests and Data Transfer. Each plan includes the monthly amounts below. | Metric | Hobby | Pro | Enterprise | | ------------- | ------------- | ------------- | ---------- | | Requests | 1M / month | 2M / month | Custom | | Data Transfer | 10 GB / month | 20 GB / month | Custom | The plan comparison is at [Azion pricing](https://www.azion.com/en/pricing/). For the per-unit rates, refer to [Pricing](/en/documentation/fundamentals/pricing/#data-stream). [Real-Time Events](/en/documentation/platform/real-time-events/data-sources/#data-stream) records each send of a stream with the number of log lines in `streamedLines` and the size in bytes in `dataStreamed`. The size of a log line depends on the template and the event. To read the account's consumption, refer to [Query Data Stream usage data](/en/documentation/guides/platform/observability/query-data-stream-usage-data-with-graphql/). --- ## Related resources - [How Data Stream works](/en/documentation/platform/data-stream/how-it-works.md): The path an event follows from its data source to the endpoint, and how a stream batches log lines. - [Endpoints](/en/documentation/platform/data-stream/endpoints.md): The fields, values, and bounds of each of the 11 endpoint types. - [Troubleshoot Data Stream](/en/documentation/platform/data-stream/troubleshooting.md): What to check when a stream sends nothing, or when its endpoint does not receive the log lines. - [Query Data Stream usage data](/en/documentation/guides/platform/observability/query-data-stream-usage-data-with-graphql.md): How to read the Requests and Data Transfer the account consumes against the amounts on this page.