Prevent App Freezing in Metrics Component with Large Datasets

[zackcl]

This PR (Resolves #1796) addresses a critical issue where the Metrics component causes the app to freeze when rendering large metrics datasets up front.

The PR implements a lazy loading mechanism for the metrics tree structure, which:

• Prepares metrics data for on-demand loading
• Supports asynchronous child node loading
• Renders child nodes only when a parent node is expanded
• Improves rendering performance by removing tree-invisible class usage (reference)

[bcb37]

This looks good Just one question.
Also, search by 'All' or 'Context' throws an error on lines 168 and 174 of metrics.component.ts in cases where there's no context. It could be fixed by coalescing like : !!data.context?.filter(...

[zackcl]

@bcb37 I resolved all your comments. Please feel free to approve this PR.

[bcb37]

Just a clarification.

[zackcl]

@bcb37 I have applied the suggested change. Please feel free to approve the PR.

[danoswaltCL]

looks good to me too, just one request to avoid the awkward conversion from promise to an observable. Please try that out, I tested it quickly and it worked on the smaller metric dataset that I have loaded in, or seemed to.

[zackcl]

@danoswaltCL Thanks for you suggestions. I have resolved all your comments and updated the deleteNode function, which was not working previously. I've tested it with large metrics datasets, and everything seems to work fine. Please feel free to approve this PR.

[zackcl]

I will review this one more time.

[danoswaltCL]

I'd approve, looks to be back to draft though, did you find an issue?

[zackcl]

I realized I didn’t need to update the deleteNode and findParents functions to make the deletion work. Instead, I needed to update the insertNode function to include the id in a node again, which I had previously removed. I will discard some of my later commits and redo them properly.

[zackcl]

@danoswaltCL Sorry for the delay, the PR is ready now. After resolving your comments (e6e82fb), I made one more commit (0db0de5) to make the node deletion work properly. Please feel free to approve this PR.