docs: document removal of shutdown flag in OTLPExporterBase (#2807)

Co-authored-by: Gerhard Stöbich <[email protected]> Co-authored-by: Daniel Dyla <[email protected]> Co-authored-by: Valentin Marchaud <[email protected]>
open-telemetry · Mar 5, 2022 · 82192b5 · 82192b5
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@@ -275,6 +275,10 @@ These instrumentations are hosted at <https://github.com/open-telemetry/opentele
 
 ## Upgrade guidelines
 
+### 0.27.x to 1.x.y
+
+- In `@opentelemetry/exporter-trace-otlp-http`, `OTLPExporterBase._isShutdown` is replaced with `_shutdownOnce`.
+
 ### 0.26.x to 0.27.x
 
 Metric and trace exporters are split into separate packages: