Prometheus

Using the label_replace function in PromQL

do something like the following:

label_replace(up, "short_hostname", "$1", "instance", "(.+):(\\d+)")

Then put {{short_hostname}} in the legend field in Grafana

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Removing old servers from Prometheus Database

Use a command similar to the following from a linux command line.

curl -X POST -g 'http://192.168.1.114:9090/api/v1/admin/tsdb/delete_series?match[]={instance="oracle1"}'

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Prometheus

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