in microprofile-extensions/microprofile-extensions-config/docker-configsource/src/main/java/org/apache/geronimo/microprofile/extensions/config/docker/BaseConfigSource.java [84:95]
private void doLoad() {
lastUpdate = clock.millis(); // first to avoid concurrent updates
final Map<String, String> entries = loader.get();
if (mapping.isEmpty()) {
this.entries = entries;
} else {
this.entries = entries
.entrySet()
.stream()
.collect(toMap(it -> mapping.getOrDefault(it.getKey(), it.getKey()), Map.Entry::getValue));
}
}