docs: include Failed container/hook logs section in rolling deployment and pre-deploy hook pages

website/docs/4-guides/1-deployments/4-rolling-deployments.md

@@ -154,13 +154,27 @@ deployment. Use this only for emergency deployments when you are confident the n
 
 ## Rollback on failure
 
-If a new container fails health monitoring during a deployment, Uncloud stops it but keeps it around so you can inspect
+If a new container fails health monitoring during a deployment, Uncloud stops it but keeps it around for inspection. For
-its state and logs. For `stop-first` order, Uncloud also restarts the old container. The deployment then stops and the
+`stop-first` order, Uncloud also restarts the old container. The deployment then stops and the remaining containers are
-remaining containers are left untouched.
+left untouched.
 
 For example, if the first container in a rolling update succeeds but the second one fails, the first replacement stays
 in place.
 
+### Failed container logs
+
+To help you diagnose the failure, `uc deploy` prints the last 10 log lines from the failed container.
+
+You can change how many lines are printed with the `UNCLOUD_FAILED_CONTAINER_LOGS_TAIL` environment variable. Set it to
+a number or to `all` to print the full container log:
+
+```shell
+export UNCLOUD_FAILED_CONTAINER_LOGS_TAIL=50
+```
+
+You can fetch the full logs with [`uc logs`](../../9-cli-reference/uc_logs.md) or inspect the status of the stopped
+container with [`uc inspect`](../../9-cli-reference/uc_inspect.md) or [`uc ps`](../../9-cli-reference/uc_ps.md).
+
 ## Retry after failure
 
 You can retry the deployment by running `uc deploy` again. Uncloud will skip the successfully deployed containers if the

website/docs/4-guides/1-deployments/5-pre-deploy-hooks.md

@@ -57,8 +57,8 @@ hook and regular service containers.
 Since your command runs in the same image as the service, any tools or dependencies it needs must be installed in that
 image.
 
-See [`x-pre_deploy`](../../8-compose-file-reference/2-extensions.md#x-pre_deploy) for all available attributes and
+See [`x-pre_deploy`](../../8-compose-file-reference/2-extensions.md#x-pre_deploy) for all available attributes and their
-their defaults.
+defaults.
 
 ### Database migrations
 
@@ -171,21 +171,15 @@ entrypoint script or your command to detect when it's running as a pre-deploy ho
 ### Non-zero exit code
 
 When the hook command exits with a non-zero code, the deployment stops immediately. No service containers are created or
-replaced. `uc deploy` prints the latest logs from the hook container to help you diagnose the issue.
+replaced. `uc deploy` prints the latest logs from the failed hook container to help you diagnose the issue and keeps it
-
+around for inspection. See [Failed hook logs](#failed-hook-logs) below for details.
-The failed hook container is not automatically removed, so you can inspect it with `uc inspect` and `uc ps`, and fetch
-its full logs as part of the service logs:
-
-```shell
-uc logs web
-```
 
 Fix the issue and run `uc deploy` again to retry.
 
 ### Timeout
 
 If the hook doesn't finish within the timeout (default **5 minutes**), Uncloud kills the container and fails the
-deployment. The stopped container is kept for inspection, same as with a non-zero exit code.
+deployment. The killed container is kept for inspection. See [Failed hook logs](#failed-hook-logs) below for details.
 
 You can increase the timeout for long-running tasks like large database migrations or data uploads:
 
@@ -197,6 +191,23 @@ services:
       timeout: 30m
 ```
 
+### Failed hook logs
+
+When a hook fails with a non-zero exit code or a timeout, `uc deploy` prints the last 10 log lines from the failed hook
+container to help you diagnose the issue.
+
+You can change how many lines are printed with the `UNCLOUD_FAILED_CONTAINER_LOGS_TAIL` environment variable. Set it to
+a number or to `all` to print the full container log. The same setting applies to regular containers that fail during a
+[rolling deployment](4-rolling-deployments.md#failed-container-logs):
+
+```shell
+export UNCLOUD_FAILED_CONTAINER_LOGS_TAIL=50
+```
+
+You can fetch the full logs as part of the service logs with [`uc logs`](../../9-cli-reference/uc_logs.md) or inspect
+the status of the failed container with [`uc inspect`](../../9-cli-reference/uc_inspect.md)
+or [`uc ps`](../../9-cli-reference/uc_ps.md).
+
 ### Idempotency
 
 Design your hook commands to be **idempotent** when possible. If a deployment fails after the hook succeeds (for
@@ -206,7 +217,7 @@ Most database migration tools handle this naturally since they track which migra
 
 ## See also
 
-- [`x-pre_deploy` reference](../../8-compose-file-reference/2-extensions.md#x-pre_deploy): All available attributes
+- [`x-pre_deploy` reference](../../8-compose-file-reference/2-extensions.md#x-pre_deploy): All available attributes and
-  and their defaults
+  their defaults
 - [Rolling deployments](4-rolling-deployments.md): How Uncloud updates containers with zero downtime
 - [Deploy an app](1-deploy-app.md): Build and deploy from source code or pre-built images