Use delta agg.

[JasmineJ1230]

Description

Use delta agg.

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Extended the documentation

[codecov-commenter]

Codecov Report

Merging #61 (a775e9c) into master (d1d349f) will decrease coverage by 0.05%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #61      +/-   ##
============================================
- Coverage     38.50%   38.45%   -0.06%     
  Complexity       71       71              
============================================
  Files            25       25              
  Lines           709      710       +1     
  Branches         69       69              
============================================
  Hits            273      273              
- Misses          419      420       +1     
  Partials         17       17              

Impacted Files	Coverage Δ
...s/telemetry/metrics/CloudWatchMetricsExporter.java	0.00% <0.00%> (ø)

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