github.com/grafana/pyroscope@v1.18.0/pkg/segmentwriter/client/distributor/placement/adaptiveplacement/testdata/plots (about) extreme_spikes.png extreme_spikes_2.png extreme_spikes_3.png low_rate_oscillations.png low_rate_oscillations_2.png steady_front.png steady_front_2.png steep_front.png steep_front_2.png