use trace logging for context errors

CHANGELOG.md

@@ -1,6 +1,11 @@
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+### Changed
+
+- use trace level logging for context errors
+
 ## 1.0.1
 ### Fixed
 

runtime/poller.go

@@ -56,6 +56,10 @@ func (p *Poller) poll(ctx context.Context, thread int) error {
 	// request a new build stage for execution from the central
 	// build server.
 	stage, err := p.Client.Request(ctx, p.Filter)
+	if err == context.Canceled || err == context.DeadlineExceeded {
+		log.WithError(err).Trace("no stage returned")
+		return nil
+	}
 	if err != nil {
 		log.WithError(err).Error("cannot request stage")
 		return err