Commas in Tag values

[umesh9794]

I have a tag like this:
key:value1, value2, value3

Both key and value is of String type.

So when I pass it to statsd I get 3 different tags on DD like this:

key:value1
value2
value3

I guess this is because statsd uses comma to separate the tags ? However not sure how it allows a tag without key or allows tags with key and with null values?