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As discussed in https://bugzilla.redhat.com/show_bug.cgi?id=1845592#c10 and reiterated on a call with a customer wishing the old Vector settings, add a 'pmproxy URL' and 'hostspec' field to the PCP Vector Host Overview dashboard.

Might need some changes in the implementation regarding the handling of empty string / null values / inheriting default settings of the datasource configuration.

Fixed upstream with

commit 422371c2ed4f47555e0565766d31fa10d13a6ac5
Author: Andreas Gerstmayr <agerstmayr>
Date:   Thu Jun 17 17:58:57 2021 +0200
 
    dashboards: add pmproxy URL and hostspec variables to the PCP Vector Host Overview dashboard

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (grafana-pcp bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:4284