initialize env mapping

Signed-off-by: Daniel Dao <dqminh@cloudflare.com>

Merge pull request google#1059 from vishh/v0.20.2

Release v0.20.2

satitize label name before setting them as prometheus label

Signed-off-by: Daniel Dao <dqminh@cloudflare.com>

Version bump

Version bump

Merge pull request google#1006 from vishh/gr-leak

Fix goroutine leak in docker fs handler logic.

Merge pull request google#1007 from vishh/release-v0.19

Release v0.19.3.2

Merge pull request google#1001 from vishh/release-v0.19

Release v0.19.3.1

Merge pull request google#981 from jimmidyson/net-stats-from-proc

Improve perf of interface stats parsing

Version bump