No ttl for label cache

[dreamerlzl]

In previous versions of parca-agent (e.g. 0.31.0) there is a ttl for the label cache like 3 * profiling duration(so it's easier to profile specific pods at will by attaching a label to a pod + relabel_configs). Now after refactoring based on otel ebpf profiler, the TTL has been removed. Is this by design?

https://github.com/parca-dev/parca-agent/blob/v0.35.1/reporter/parca_reporter.go#L450

[brancz]

No particular reason, we can definitely add TTL again!