Checkmk Werk 15733: Single-metric dashlets and metric views: Fix scaling issues

ID: 15733 Title: Single-metric dashlets and metric views: Fix scaling issues Component: metrics Level: 1 Class: Bug fix Version: 2.3.0b1 The single-metric dashlets had scaling issues when displaying historic values for certain metrics, in particular for filesystem metrics such as the filesystem size. This issue also affected the view columns `Services: Metric History` and `Services: Metric Forecast`.