Update Troubleshooting Guide with v1.21 and Feedback from #726

[sachin21212121]

This PR updates the troubleshooting guide with:

1. Steps for fixing keadm init download failures.

2. Correct CRD references for v1.21.0.

3. Additional troubleshooting for Pending/Terminating pods.

4. Logging instructions for CloudCore, EdgeCore, and Pods.

5. Updates based on feedback from Shelley in update troubleshooting guide with CRD links and improved formatting #726
   .

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[gemini-code-assist]

Summary of Changes

Hello @sachin21212121, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly overhauls the KubeEdge troubleshooting documentation. The primary goal is to provide clearer, more up-to-date guidance for users encountering common issues during setup and operation, particularly concerning keadm init failures, pod lifecycle problems, and log retrieval. These changes aim to streamline the debugging process and improve the overall user experience by offering precise steps and relevant version-specific information.

Highlights

• Updated Troubleshooting Guide: The troubleshooting guide has been significantly updated to address common issues more comprehensively.
• keadm init Download Failures: New steps have been added to guide users through fixing keadm init download failures, specifically detailing manual downloads for KubeEdge v1.21.0 releases and CRDs.
• Corrected CRD References: The guide now correctly references v1beta1 CRDs for KubeEdge v1.21.0, replacing older v1alpha versions for device-related CRDs.
• Pending/Terminating Pods: Enhanced troubleshooting steps are provided for pods stuck in Pending or Terminating states, including checks for node health, pod descriptions, EdgeCore logs, architecture compatibility, and disk space.
• Logging Instructions: Detailed instructions for viewing logs for CloudCore, EdgeCore, and pods have been added, covering both systemd and manual execution scenarios, as well as direct file access and kubectl logs.
• Feedback Incorporation: Updates based on feedback from a previous pull request (update troubleshooting guide with CRD links and improved formatting #726) have been integrated to improve clarity and accuracy.

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[gemini-code-assist]

Code Review

This pull request provides a much-needed update to the troubleshooting guide, bringing it up to date with KubeEdge v1.21.0. The restructuring of the content and the addition of new troubleshooting steps for pod states and logging significantly improve the document's clarity and usefulness. However, I've identified a critical formatting issue where the entire file has been wrapped in a markdown code block, which will prevent the page from rendering correctly. Additionally, the links for downloading CRD files are incorrect. My review includes suggestions to fix these issues and a minor change to improve structural consistency.

[gemini-code-assist]

The file starts with a blank line and a markdown code fence. This is invalid and will cause rendering issues. The YAML frontmatter must be at the very beginning of the file, and the markdown fence is causing the entire document to be treated as a code block. Please remove the blank line and the fence.

[gemini-code-assist]

These closing markdown fences are unnecessary and likely related to the invalid opening fence at the start of the file. They should be removed to prevent rendering issues.

[gemini-code-assist]

The links to the CRD YAML files point to the GitHub HTML view (github.com/.../blob/...) instead of the raw file content. This will prevent users from downloading the files directly using tools like wget or curl. Please update the links to point to the raw content on raw.githubusercontent.com.

Suggested change

	- [devices_v1beta1_device.yaml](https://github.com/kubeedge/kubeedge/blob/v1.21.0/build/crds/devices/devices_v1beta1_device.yaml)
	- [devices_v1beta1_devicemodel.yaml](https://github.com/kubeedge/kubeedge/blob/v1.21.0/build/crds/devices/devices_v1beta1_devicemodel.yaml)
	- [cluster_objectsync_v1alpha1.yaml](https://github.com/kubeedge/kubeedge/blob/v1.21.0/build/crds/reliablesyncs/cluster_objectsync_v1alpha1.yaml)
	- [objectsync_v1alpha1.yaml](https://github.com/kubeedge/kubeedge/blob/v1.21.0/build/crds/reliablesyncs/objectsync_v1alpha1.yaml)
	- [devices_v1beta1_device.yaml](https://raw.githubusercontent.com/kubeedge/kubeedge/v1.21.0/build/crds/devices/devices_v1beta1_device.yaml)
	- [devices_v1beta1_devicemodel.yaml](https://raw.githubusercontent.com/kubeedge/kubeedge/v1.21.0/build/crds/devices/devices_v1beta1_devicemodel.yaml)
	- [cluster_objectsync_v1alpha1.yaml](https://raw.githubusercontent.com/kubeedge/kubeedge/v1.21.0/build/crds/reliablesyncs/cluster_objectsync_v1alpha1.yaml)
	- [objectsync_v1alpha1.yaml](https://raw.githubusercontent.com/kubeedge/kubeedge/v1.21.0/build/crds/reliablesyncs/objectsync_v1alpha1.yaml)

[gemini-code-assist]

For better document structure and consistency with other sections, this subheading should be a level 4 markdown header (####) instead of bolded text.

Suggested change

	**Run keadm init with version flag**
	#### Run keadm init with version flag