node:memory-mgr: Add logs on the happy path

We have reasonable amount of logs when things go wrong.
While debugging, it can be useful to have logs to indicate that
things have gone as expected especially when it comes to
important events like successful startup of memory manager
and successful allocation of resources.

Signed-off-by: Swati Sehgal <swsehgal@redhat.com>

pkg/kubelet/cm/memorymanager/memory_manager.go

@@ -205,6 +205,7 @@ func (m *manager) Start(activePods ActivePodsFunc, sourcesReady config.SourcesRe
 
 	m.allocatableMemory = m.policy.GetAllocatableMemory(m.state)
 
+	klog.V(4).InfoS("memorymanager started", "policy", m.policy.Name())
 	return nil
 }
 

pkg/kubelet/cm/memorymanager/policy_static.go

@@ -196,6 +196,7 @@ func (p *staticPolicy) Allocate(s state.State, pod *v1.Pod, container *v1.Contai
 	// TODO: we should refactor our state structs to reflect the amount of the re-used memory
 	p.updateInitContainersMemoryBlocks(s, pod, container, containerBlocks)
 
+	klog.V(4).InfoS("Allocated exclusive memory", "pod", klog.KObj(pod), "containerName", container.Name)
 	return nil
 }