I've successfully tested this in inputs.conf for polling SNMP metrics with the SNMP modular input. I used 4 spaces to indent, rather than a tab character.
[snmp://blah_blah_polling]
...
snmp_mode = attributes
object_names = <really_long_oid_1>, \
<really_long_oid_2>, \
<really_long_oid_3>, \
...
I haven't tested it, but I suspect this might work for rename :
[newline_three]
definition = rename _time AS g | \
eval ones=1
This is identical to [newline_one] except that the pipe character is before the line break instead of after.
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