tls options to history:rewrite rules, allowing customising TLS options for requests made by karma to Prometheus servers when querying alert history, #3707.
Unsilenced alerts will now show recently expired silences if they are old enough.
By default silences expired in the last 10 minutes will be shown, this can be configured by setting silences:expired option or --silences.expired flag.
Setting this value to 5m will show silences if they expired in the last 5 minutes but only if the alert started firing at least 5 minutes ago.
alertAcknowledgement:comment will replace %NOWLOC% string with a timestamp formatted using local time zone, use %NOW% for timestamps using UTC timezone, #3704.
to automatically adjust GOMAXPROCS to match Linux container CPU quota.
Runtime value of GOMAXPROCS is now exported as a go_max_procs metric.
API will now return only first 40 alert groups by default, the rest can
be loaded when user clicks on the Load more button. grid:groupLimit config option was added to customise how many groups
are returned and displayed in the UI by default.