influxdb: add missing statds/dogstastd metrics

[cpanato]

What type of PR is this?
/kind cleanup

Any specific area of the project related to this PR?

/area outputs

What this PR does / why we need it:
influxdb: add missing statds/dogstastd metrics

Which issue(s) this PR fixes:

Fixes partially #144

Special notes for your reviewer:

/assign @Issif

[poiana]

@cpanato: The label(s) area/outputs cannot be applied, because the repository doesn't have them

In response to this:

What type of PR is this?
/kind cleanup

Any specific area of the project related to this PR?

/area outputs

What this PR does / why we need it:
influxdb: add missing statds/dogstastd metrics

Which issue(s) this PR fixes:

Fixes partially #144

Special notes for your reviewer:

/assign @Issif

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[poiana]

LGTM label has been added.

Git tree hash: c2c259c9cb9420f51be2db706a0bdb9411ee904c

[poiana]

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