Line exclusion rules don't seem to take effect

[tishma]

Hi, it's either missing in the docs, or I'm missing something obvious, but as far as I am concerned, LOGDNA_LINE_EXCLUSION_REGEX doesn't seem to be working.
My idea was to suppress agent's own log messages, by adding (to /etc/logdna.env):
LOGDNA_LINE_EXCLUSION_REGEX=(?:logdna\-agent).
Also tried:
LOGDNA_LINE_EXCLUSION_REGEX=(?:logdna-agent)
I was able to achieve the similar effect by editing exclusion rules in the GUI, but why not save some traffic on the agent side.