I'm looking for a way to deal with a situation where we end up with null
characters trailing some label values: `count({ifDescr=~".*\x00"}) != 0`.
The source of the problem seems to be with `ifDescr` returned as a
`Hex-String` instead of what the MIB says should be a `DisplayString`...
for __some__ servers.
# Good, 99% of servers:
$ snmpget -v 2c -c $creds 172.21.34.10 1.3.6.1.2.1.2.2.1.2.1
iso.3.6.1.2.1.2.2.1.2.1 = STRING: "eth0"
# Bad, Cisco CVP tsk tsk tsk...
$ snmpget -v 2c -c $creds 172.20.220.88 1.3.6.1.2.1.2.2.1.2.1
iso.3.6.1.2.1.2.2.1.2.1 = Hex-STRING: 53 6F 66 74 77 61 72 65 20 4C 6F 6F
70 62 61 63
6B 20 49 6E 74 65 72 66 61 63 65 20 31 00
I'm currently planning on using `metric_relabel_configs` to cleanup the
trailing nulls on these and other similar situations I uncovered.
Is there better way than mopping up like that? Perhaps snmp-exporter can
deal with these and convert somehow? I'm not familiar enough with it to
figure out if it can or not.
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