momo-jun commented on code in PR #16434:
URL: https://github.com/apache/pulsar/pull/16434#discussion_r923017432
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site2/docs/admin-api-transactions.md:
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@@ -0,0 +1,712 @@
+---
+id: admin-api-transactions
+title: Manage transactions
+sidebar_label: "Transactions"
+---
+
+````mdx-code-block
+import Tabs from '@theme/Tabs';
+import TabItem from '@theme/TabItem';
+````
+
+
+:::tip
+
+This page only shows **some frequently used operations**.
+
+- For the latest and complete information about `Pulsar admin`, including
commands, flags, descriptions, and more, see [Pulsar admin
doc](/tools/pulsar-admin/)
+
+- For the latest and complete information about `REST API`, including
parameters, responses, samples, and more, see {@inject: rest:REST:/} API doc.
+
+- For the latest and complete information about `Java admin API`, including
classes, methods, descriptions, and more, see [Java admin API doc](/api/admin/).
+
+:::
+
+## Transaction resources
+
+### GetSlowTransactions
+
+In the production environment, there may be some long-lasting transactions
that have never been completed. You can get these slow transactions that have
survived over a certain time under a coordinator or all coordinators in the
following ways.
+
+````mdx-code-block
+<Tabs groupId="api-choice"
+ defaultValue="pulsar-admin"
+ values={[{"label":"pulsar-admin","value":"pulsar-admin"},{"label":"REST
API","value":"REST API"},{"label":"Java","value":"Java"}]}>
+<TabItem value="pulsar-admin">
+
+```shell
+
+$ pulsar-admin transactions slow-transactions \
+ -c 1 -t 1s
+
+```
+
+</TabItem>
+<TabItem value="REST API">
+
+{@inject:
endpoint|GET|/admin/v3/transactions/slowTransactions/:timeout|operation/getSlowTransactions?version=@pulsar:version_number@}
+
+</TabItem>
+<TabItem value="Java">
+
+```java
+
+admin.transaction().getSlowTransactionsByCoordinatorId(coordinatorId, timeout,
timeUnit)
+//Or get slow transactions from all coordinators
+admin.transaction().getSlowTransactions(timeout, timeUnit)
+
+```
+
+</TabItem>
+
+</Tabs>
+````
+
+### ScaleTransactionCoordinators
+
+When the performance of transactions reaches a bottleneck due to the
insufficient number of transaction coordinators, you can scale the number of
the transaction coordinators in the following ways.
+
+````mdx-code-block
+<Tabs groupId="api-choice"
+ defaultValue="pulsar-admin"
+ values={[{"label":"pulsar-admin","value":"pulsar-admin"},{"label":"REST
API","value":"REST API"},{"label":"Java","value":"Java"}]}>
+<TabItem value="pulsar-admin">
+
+```shell
+
+$ pulsar-admin transactions scale-transactionCoordinators \
+ -r 17
+
+```
+
+</TabItem>
+<TabItem value="REST API">
+
+{@inject:
endpoint|GET|/admin/v3/transactions/transactionCoordinator/:replicas|operation/scaleTransactionCoordinators?version=@pulsar:version_number@}
+
+</TabItem>
+<TabItem value="Java">
+
+```java
+
+admin.transaction().scaleTransactionCoordinators(replicas);
+
+```
+
+</TabItem>
+
+</Tabs>
+````
+
+## Transaction stats
+
+### Get transaction metadata
+
+The transaction metadata that can be retrieved include:
+* **txnId:** The ID of this transaction.
+* **status:** The status of this transaction.
+* **openTimestamp:** The open time of this transaction.
+* **timeoutAt:** The timeout of this transaction.
Review Comment:
The term `[timeout](https://en.wikipedia.org/wiki/Timeout_(computing))`
self-contains the meaning of a period of time.
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