Alexy unified changes

[reggie-k]

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
• The title of the PR conforms to the Toolchain Guide
• I've included "Closes [ISSUE #]" or "Fixes [ISSUE #]" in the description to automatically close the associated issue.
• I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
• Does this PR require documentation updates?
• I've updated documentation as required by this PR.
• I have signed off all my commits as required by DCO
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My build is green (troubleshooting builds).
• My new feature complies with the feature status guidelines.
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• Optional. My organization is added to USERS.md.
• Optional. For bug fixes, I've indicated what older releases this fix should be cherry-picked into (this may or may not happen depending on risk/complexity).

[reggie-k]

@CodiumAI-Agent /review

[CodiumAI-Agent]

PR Review

⏱️ Estimated effort to review [1-5]	4, because the PR introduces a significant amount of changes across various files, including new features, modifications to existing logic, and updates to tests. The complexity of the changes, especially around the new ApplicationSet watch functionality and modifications to helm client behavior, requires careful review to ensure correctness, performance implications, and adherence to best practices. Additionally, the changes to session management and error handling patterns in various components add to the review complexity.
🧪 Relevant tests	Yes
🔍 Possible issues	Possible Bug: The introduction of locking mechanisms in session management (sessionmanager.go) and helm client (client.go) could potentially introduce deadlocks or performance bottlenecks if not implemented correctly. It's crucial to ensure that locks are always released correctly, even in error scenarios, and to evaluate the performance impact of these locks in high-concurrency environments.
	Security Concern: The changes in error handling and the introduction of new API endpoints (e.g., ApplicationSet watch functionality) could potentially introduce new security vulnerabilities, such as information disclosure or improper error handling leading to denial of service. It's important to carefully review these changes to ensure they adhere to security best practices and do not expose sensitive information or introduce new attack vectors.
🔒 Security concerns	Sensitive information exposure: The PR includes changes to error handling and logging. It's important to ensure that these changes do not lead to the exposure of sensitive information in logs or error messages, especially in production environments. Reviewing the changes for potential information disclosure vulnerabilities is recommended.

Code feedback:

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relevant file	util/session/sessionmanager.go
suggestion	Consider implementing a more fine-grained locking strategy to minimize the scope of locks and reduce the risk of deadlocks or performance issues in high-concurrency scenarios. For example, using separate locks for read and write operations could improve performance while maintaining thread safety. [important]
relevant line	func (mgr *SessionManager) updateFailureCount(username string, failed bool) {

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relevant file	util/helm/client.go
suggestion	Evaluate the performance implications of the global lock used in helm client operations, especially in environments with high concurrency. If the lock becomes a bottleneck, consider alternatives such as sharded locks or lock-free data structures to improve scalability. [important]
relevant line	var globalLock = sync.NewKeyLock()

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relevant file	server/applicationset/applicationset.go
suggestion	Ensure that the new ApplicationSet watch functionality properly handles error scenarios and cleans up resources (e.g., closing channels and connections) to avoid resource leaks or partial state updates that could lead to inconsistent behavior. [important]
relevant line	func (s *Server) Watch(q *applicationset.ApplicationSetWatchQuery, ws applicationset.ApplicationSetService_WatchServer) error {

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relevant file	pkg/apis/application/v1alpha1/openapi_generated.go
suggestion	Review the auto-generated OpenAPI definitions for the new ApplicationSetWatchEvent type to ensure that it accurately reflects the intended schema and does not expose any unintended fields or types. Consider adding more detailed descriptions or examples if necessary to improve API documentation. [medium]
relevant line	"github.com/argoproj/argo-cd/v2/pkg/apis/application/v1alpha1.ApplicationSetWatchEvent": schema_pkg_apis_application_v1alpha1_ApplicationSetWatchEvent(ref),

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