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Description of problem:
ip -j route produces non-parsable json output if called on routes with tcp metrics.

Steps to Reproduce:
1. $ ip link add type dummy
2. $ ip route add 192.168.2.0 dev dummy0 metric 100 mtu 1000 rto_min 3
3. $ ip -j route | jq

Actual results:
    parse error: ':' not as part of an object at line 1, column 319

Expected results:
    $ ip -j route | jq
    [
      {
        "dst": "192.168.2.0",
        "dev": "dummy0",
        "scope": "link",
        "metric": 100,
        "flags": [],
        "metrics": [
          {
            "mtu": 1000,
            "rto_min": 3
          }
        ]
      }
    ]

Upstream commit to be backported:

commit 89ce8012d71f5689074dc4cbe3db102cbdf76460
Author: Andrea Claudi <aclaudi>
Date:   Mon Jul 8 11:36:42 2019 +0200

    ip-route: fix json formatting for metrics

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, 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-2020:1785