[core] Close fetch / fetchSeries spans

[lmuhlha]

No description provided.

[malish8632]

LGTM

[codecov]

Codecov Report

Merging #680 (c08c248) into master (4ab6620) will decrease coverage by 0.55%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master     #680      +/-   ##
============================================
- Coverage     54.41%   53.86%   -0.56%     
+ Complexity     3053     2961      -92     
============================================
  Files           735      726       -9     
  Lines         19868    19428     -440     
  Branches       1304     1279      -25     
============================================
- Hits          10812    10465     -347     
+ Misses         8590     8517      -73     
+ Partials        466      446      -20     

Impacted Files	Coverage Δ	Complexity Δ
.../spotify/heroic/tracing/EndSpanFutureReporter.java	35.71% <ø> (ø)	2.00 <0.00> (ø)
.../com/spotify/heroic/metric/LocalMetricManager.java	68.35% <0.00%> (+2.27%)	4.00 <0.00> (ø)
...igtable/credentials/DefaultCredentialsBuilder.java	66.66% <0.00%> (-33.34%)	2.00% <0.00%> (-1.00%)
.../com/spotify/heroic/common/ValueOptionalLimit.java	40.74% <0.00%> (-14.82%)	17.00% <0.00%> (-3.00%)
...com/spotify/heroic/aggregation/simple/MaxBucket.kt	44.44% <0.00%> (-11.12%)	4.00% <0.00%> (-1.00%)
.../com/spotify/heroic/common/EmptyOptionalLimit.java	61.76% <0.00%> (-8.83%)	17.00% <0.00%> (-2.00%)
...y/heroic/metric/bigtable/BigtableMetricModule.java	79.71% <0.00%> (-6.15%)	5.00% <0.00%> (-2.00%)
...com/spotify/heroic/metric/MetricManagerModule.java	70.40% <0.00%> (-3.70%)	16.00% <0.00%> (-2.00%)
...ytics/bigtable/BigtableAnalyticsMetricBackend.java	23.80% <0.00%> (-3.47%)	2.00% <0.00%> (-1.00%)
...heroic/suggest/elasticsearch/SuggestBackendKV.java	80.16% <0.00%> (-2.09%)	61.00% <0.00%> (-16.00%)
... and 35 more

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[sming]

LGTM. What are the throws Exception moves about - just fixing compiler warnings?

[lmuhlha]

LGTM. What are the throws Exception moves about - just fixing compiler warnings?

Yes indeed :)

Going to add some more changes to this PR after I continue troubleshooting.