refactor: remove fluentd and identity arg

[JoanFM]

No description provided.

[github-actions]

Latency summary

Current PR yields:

• 🐢🐢 index QPS at 1086, delta to last 2 avg.: -11%
• 🐎🐎🐎🐎 query QPS at 54, delta to last 2 avg.: +153%
• 🐎🐎 avg flow time within 1.631 seconds, delta to last 2 avg.: +6%
• 🐢🐢 import jina within 0.2969 seconds, delta to last 2 avg.: -36%

Breakdown

Version	Index QPS	Query QPS	Avg Flow Time (s)	Import Time (s)
current	1086	54	1.631	0.2969
2.6.4	1330	22	1.4948	0.4235
2.6.3	1129	19	1.5726	0.5132

Backed by latency-tracking. Further commits will update this comment.

[codecov]

Codecov Report

Merging #4199 (1f04634) into master (dfbabd5) will increase coverage by 0.27%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4199      +/-   ##
==========================================
+ Coverage   87.10%   87.37%   +0.27%     
==========================================
  Files         114      114              
  Lines        8304     8269      -35     
==========================================
- Hits         7233     7225       -8     
+ Misses       1071     1044      -27     

Flag	Coverage Δ
daemon	42.30% <100.00%> (-0.25%)	⬇️
jina	86.56% <100.00%> (+0.31%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
jina/__init__.py	70.58% <ø> (ø)
jina/orchestrate/flow/base.py	90.98% <ø> (-0.14%)	⬇️
jina/orchestrate/peas/jinad.py	92.18% <ø> (-1.25%)	⬇️
jina/logging/logger.py	91.76% <100.00%> (-1.10%)	⬇️
jina/orchestrate/peas/__init__.py	90.00% <100.00%> (ø)
jina/orchestrate/pods/__init__.py	80.72% <100.00%> (+2.87%)	⬆️
jina/parsers/flow.py	100.00% <100.00%> (ø)
jina/parsers/peapods/base.py	100.00% <100.00%> (ø)
jina/serve/networking.py	83.73% <0.00%> (+0.27%)	⬆️
... and 3 more

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[numb3r3]

After this PR, how to enable fluentd in Jina?