fix(chart): fixes a compatibility issue with the Helm Chart and Prometheus v3.0+ #1811
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In the Flagger Helm Chart Prometheus config the storage retention duration is set via this flag --storage.tsdb.retention. This Flag was deprecated in a previous version of Prometheus and removed from Prometheus v3.0+ which means the current Flagger Helm Chart is incompatible with the newer Prometheus versions.
This flag has now been updated to --storage.tsdb.retention.time which is backwards compatible down to Prometheus v2.51 at least.