Add "unit" to BaseInstrument

[bogdandrutu]

No description provided.

[codecov-io]

Codecov Report

Merging #829 into master will increase coverage by 0.21%.
The diff coverage is 81.48%.

@@             Coverage Diff              @@
##             master     #829      +/-   ##
============================================
+ Coverage     78.67%   78.89%   +0.21%     
+ Complexity      798      797       -1     
============================================
  Files           106      106              
  Lines          2856     2885      +29     
  Branches        278      275       -3     
============================================
+ Hits           2247     2276      +29     
+ Misses          505      504       -1     
- Partials        104      105       +1

Impacted Files	Coverage Δ	Complexity Δ
.../io/opentelemetry/sdk/metrics/LongObserverSdk.java	53.84% <100%> (+10.98%)	2 <1> (ø)	⬇️
...a/io/opentelemetry/sdk/metrics/LongCounterSdk.java	65.71% <100%> (+5.71%)	5 <1> (ø)	⬇️
...o/opentelemetry/sdk/metrics/DoubleObserverSdk.java	53.84% <100%> (+10.98%)	2 <1> (ø)	⬇️
...io/opentelemetry/sdk/metrics/DoubleCounterSdk.java	65.71% <100%> (+5.71%)	5 <1> (ø)	⬇️
...a/io/opentelemetry/sdk/metrics/LongMeasureSdk.java	65.71% <100%> (+5.71%)	5 <1> (ø)	⬇️
...io/opentelemetry/sdk/metrics/DoubleMeasureSdk.java	65.71% <100%> (+5.71%)	5 <1> (ø)	⬇️
...a/io/opentelemetry/sdk/metrics/BaseInstrument.java	30.43% <16.66%> (+5.43%)	1 <1> (ø)	⬇️
...ntelemetry/sdk/trace/RecordEventsReadableSpan.java	90.3% <0%> (-1.22%)	44% <0%> (-1%)

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[jkwatson]

👍

[bogdandrutu]

Trivial change, merging now.