tsdb: default too small max block duration
tsdb: default too small max block duration

prometheus/prometheus,AlekSi/prometheus,AlekSi/prometheus,GoogleCloudPlatform/prometheus,brancz/prometheus,GoogleCloudPlatform/prometheus,keegancsmith/prometheus,Stackdriver/stackdriver-prometheus,Gouthamve/prometheus,Gouthamve/prometheus,amorken/prometheus,brancz/prometheus,AlekSi/prometheus,prometheus/prometheus,GoogleCloudPlatform/prometheus,GoogleCloudPlatform/prometheus,amorken/prometheus,keegancsmith/prometheus,Gouthamve/prometheus,brancz/prometheus,Stackdriver/stackdriver-prometheus,kangwoo/prometheus,keegancsmith/prometheus,alileza/prometheus,Conorbro/prometheus,keegancsmith/prometheus,Conorbro/prometheus,prometheus/prometheus,Gouthamve/prometheus,Stackdriver/stackdriver-prometheus,prometheus/prometheus,alileza/prometheus,GoogleCloudPlatform/prometheus,AlekSi/prometheus,Conorbro/prometheus,Stackdriver/stackdriver-prometheus,kangwoo/prometheus,kangwoo/prometheus,amorken/prometheus,alileza/prometheus,brancz/prometheus,kangwoo/prometheus,prometheus/prometheus,alileza/prometheus,alileza/prometheus,amorken/prometheus,Conorbro/prometheus,keegancsmith/prometheus