v1.5.4

Fixes

• Allow editing of lerner_config field in TiFlash spec (#1494, @AstroProfundis)
• Fix incorrect timeout for telemetry requests (#1500, @AstroProfundis)
• Ingore data_dir of monitor agents when checking for directory overlaps (#1510, @AstroProfundis)

Improvements

• Distinguish cookie names of multiple grafana instances on the same host (#1491, @AstroProfundis)