refactor(monitoring): remove monitoring resources when disabled

Walkthrough

The pull request introduces several enhancements to the GreptimeDBCluster controller and its related components. A new method, removeMonitoringDB, is added to manage the cleanup of monitoring resources when monitoring is disabled. The reconciliation logic is updated to incorporate a check for the monitoring feature, invoking this new method as necessary. Additionally, various deployer files are modified to simplify monitoring checks by using an IsEnabled() method. The changes also include updates to the test suite to ensure proper functionality when monitoring is disabled.

Changes

File Path	Change Summary
controllers/greptimedbcluster/controller.go	Added `removeMonitoringDB` method to clean up monitoring resources when disabled; updated `Reconcile` method to call this new method.
controllers/greptimedbcluster/deployers/datanode.go, controllers/greptimedbcluster/deployers/flownode.go, controllers/greptimedbcluster/deployers/frontend.go, controllers/greptimedbcluster/deployers/meta.go	Updated monitoring checks to use `IsEnabled()` method; modified `generatePodTemplateSpec` in `datanode.go` to reflect new condition.
controllers/greptimedbcluster/deployers/monitoring.go	Simplified monitoring checks in `MonitoringDeployer` and `monitoringBuilder`; updated method logic for status checks.
tests/e2e/greptimedbcluster/test_cluster_enable_monitoring.go	Enhanced test to disable monitoring and verify the cluster status remains `PhaseRunning`.

Possibly related PRs

#186: The changes in this PR involve significant modifications to the Reconcile method in controllers/greptimedbcluster/controller.go, which is directly related to the enhancements made in the main PR regarding the Reconciler struct and its methods, particularly in the context of validation logic for the GreptimeDBCluster.
#190: This PR introduces new specifications and structures related to monitoring within the GreptimeDBClusterSpec, which aligns with the main PR's focus on managing monitoring resources and the conditional checks for monitoring features in the reconciliation process.

Suggested reviewers

daviderli614

Poem

Hop, hop, hooray, what a sight to see,
Monitoring's toggled, as easy as can be!
With a flick of a switch, resources we clear,
In the land of clusters, there's nothing to fear!
So let’s dance in the meadow, where code flows free,
For a cleaner, brighter future, just you and me! 🐇✨

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GreptimeTeam / greptimedb-operator