Special characters used in the dogstatsd protocol are not escaped

[deadok22]

The library does not escape special characters in metric names and tags, which can result in malformed packets and unexpected tags being sent over the wire.

The following characters in tag keys and values should be replaced: |, ,, #, \n.
The following characters in metric names should be replaced: |, :, \n.

E.g. this:

c = new StatsD();
c.gauge("check:11|g#this:out", 42, 1, ["tag1,tag2,\ntag3"]);

Results in:

$ nc -u -l localhost 8125
check:11|g#this:out:42|g|#tag1,tag2,
tag3

Similar issues in other dogstatsd client implementations:

• Special characters used in the dogstatsd protocol are not escaped in metric name and namespace DataDog/datadogpy#740
• Special characters used in the dogstatsd protocol are not escaped DataDog/datadog-go#265
• Special characters are not escaped DataDog/java-dogstatsd-client#199