DL1231 commented on code in PR #20021:
URL: https://github.com/apache/kafka/pull/20021#discussion_r2163133666
##########
metadata/src/main/java/org/apache/kafka/image/loader/metrics/MetadataLoaderMetrics.java:
##########
@@ -142,16 +185,44 @@ public long handleLoadSnapshotCount() {
return this.handleLoadSnapshotCount.get();
}
+ public void setFinalizedFeatureLevel(String featureName, short
featureLevel) {
+ finalizedFeatureLevels.put(featureName, featureLevel);
+ }
+
+ public short finalizedFeatureLevel(String featureName) {
+ return finalizedFeatureLevels.getOrDefault(featureName, (short) 0);
+ }
+
@Override
public void close() {
registry.ifPresent(r -> List.of(
CURRENT_METADATA_VERSION,
CURRENT_CONTROLLER_ID,
HANDLE_LOAD_SNAPSHOT_COUNT
).forEach(r::removeMetric));
+ for (var featureName : finalizedFeatureLevels.keySet()) {
+ removeFinalizedFeatureLevelMetric(featureName);
+ }
}
private static MetricName getMetricName(String type, String name) {
return KafkaYammerMetrics.getMetricName("kafka.server", type, name);
}
+
+ private static MetricName getFeatureNameTagMetricName(String type, String
name, String featureName) {
+ LinkedHashMap<String, String> featureNameTag = new LinkedHashMap<>();
+ featureNameTag.put(FEATURE_NAME_TAG, sanitizeFeatureName(featureName));
+ return KafkaYammerMetrics.getMetricName("kafka.server", type, name,
featureNameTag);
+ }
+
+ private static String sanitizeFeatureName(String featureName) {
+ final var words = featureName.split("\\.");
+ final var builder = new StringBuilder(words[0]);
+ for (int i = 1; i < words.length; i++) {
+ final var word = words[i];
+ builder.append(word.substring(0, 1).toUpperCase(Locale.ROOT))
+ .append(word.substring(1).toLowerCase(Locale.ROOT));
Review Comment:
Could we use `charAt(0)` to directly get the first character? This avoids
creating temporary strings by `substring`.
```suggestion
builder.append(Character.toUpperCase(word.charAt(0)))
.append(word.substring(1).toLowerCase(Locale.ROOT));
```
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