Prometheus Connector Initial Code

[vamsi-amazon]

Signed-off-by: vamsi-amazon reddyvam@amazon.com

Description

This CR Includes PrometheusMetricScan and other basic boilerplate code to connect to prometheus.

Issues Resolved

#620

Check List

• New functionality includes testing.
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented.
  • New functionality has javadoc added
  • New functionality has user manual doc added
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov-commenter]

Codecov Report

Merging #878 (182ef76) into 2.x (057fa44) will decrease coverage by 2.80%.
The diff coverage is 99.08%.

@@             Coverage Diff              @@
##                2.x     #878      +/-   ##
============================================
- Coverage     97.87%   95.06%   -2.81%     
- Complexity     3020     3049      +29     
============================================
  Files           284      300      +16     
  Lines          7425     8192     +767     
  Branches        475      599     +124     
============================================
+ Hits           7267     7788     +521     
- Misses          157      350     +193     
- Partials          1       54      +53     

Flag	Coverage Δ
query-workbench	62.76% <ø> (?)
sql-engine	97.88% <99.08%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
...theus/data/constants/PrometheusFieldConstants.java	0.00% <0.00%> (ø)
...ch/sql/prometheus/client/PrometheusClientImpl.java	100.00% <100.00%> (ø)
...theus/request/PrometheusDescribeMetricRequest.java	100.00% <100.00%> (ø)
...sql/prometheus/request/PrometheusQueryRequest.java	100.00% <100.00%> (ø)
...ch/sql/prometheus/response/PrometheusResponse.java	100.00% <100.00%> (ø)
...h/sql/prometheus/storage/PrometheusMetricScan.java	100.00% <100.00%> (ø)
...h/public/components/QueryLanguageSwitch/Switch.tsx	85.71% <0.00%> (ø)
workbench/public/components/Main/main.tsx	53.00% <0.00%> (ø)
workbench/public/application.tsx	0.00% <0.00%> (ø)
...ch/public/components/QueryResults/QueryResults.tsx	61.60% <0.00%> (ø)
... and 6 more

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[dai-chen]

Thanks for the changes! A minor comment: please add javadoc to PrometheusClient since it's a core class.

[dai-chen]

Link #623 and #620 ?

It maybe helpful for community and us to track by adding this to #561

Linked will mention these in 561.

[vamsi-amazon]

Thanks for the changes! A minor comment: please add javadoc to PrometheusClient since it's a core class.

Will add in the new PR. might require additional approvals.