Influx Tag mapper (#1513)

[LukasVyhlidka]

Pull request for issue #1513

[PyvesB]

From what I can tell, this would do the job, though I believe there's a potential problem with escaping of field values. If t.getValue() itself contains quotes, those would need to be escaped when using the line protocol. Indeed, according to the InfluxDB documentation:

For string field values use a backslash character \ to escape double quotes "

[tommcdo]

Influx also supports fields of other types, so I wonder if it some specialized serialization would be useful here.

In my use case, I need to write multiple fields with numerical values.

[leonardehrenfried]

Hello all, I was also hit with the "high series cardinality" problem in influxdb and this seems like the correct solution.

If I resolved the merge conflicts, fixed the escaping and resubmitted it, would there be a chance that it will be merged?