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add metric for monitor max queued record num shard #905

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dc1f9eb
add metric for max queued shard
flashmouse Jan 4, 2026
c6d81d2
add doc
flashmouse Jan 4, 2026
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4 changes: 4 additions & 0 deletions CHANGELOG.adoc
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Expand Up @@ -20,6 +20,10 @@ endif::[]

* fix: keep instantiated OffsetMapCodecManager so that metrics will not be recreated every commit (#859)

=== Improvements

* improvement: add metric to monitor the maximum number of queued records for the shard

== 0.5.3.3

=== Fixes
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6 changes: 6 additions & 0 deletions README.adoc
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Expand Up @@ -1129,6 +1129,12 @@ Gauge `pc.shards.size{subsystem=shardmanager}`

Number of records queued for processing across all shards

**Max Shards Size**

Gauge `pc.shards.max.size{subsystem=shardmanager}`

The number of queued records in the shards with the most queued records

==== Work Manager

**Inflight Records**
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1 change: 1 addition & 0 deletions parallel-consumer-core/src/main/java/io/confluent/parallelconsumer/metrics/PCMetricsDef.java
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Expand Up @@ -38,6 +38,7 @@ public enum PCMetricsDef {

INCOMPLETE_OFFSETS_TOTAL("incomplete.offsets.total", "Total number of incomplete offsets", PCMetricsSubsystem.SHARD_MANAGER, GAUGE),
SHARDS_SIZE("shards.size", "Number of records queued for processing across all shards", PCMetricsSubsystem.SHARD_MANAGER, GAUGE),
SHARDS_MAX_SIZE("shards.max.size", "The number of queued records in the shards with the most queued records", PCMetricsSubsystem.SHARD_MANAGER, GAUGE),


//TODO: Not implemented yet - add to Metrics.adoc when implemented
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6 changes: 5 additions & 1 deletion parallel-consumer-core/src/main/java/io/confluent/parallelconsumer/state/ShardManager.java
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Expand Up @@ -83,6 +83,7 @@ public class ShardManager<K, V> {
private Optional<ShardKey> iterationResumePoint = Optional.empty();

private Gauge shardsSizeGauge;
private Gauge shardsMaxSizeGauge;
private Gauge numberOfShardsGauge;

private final PCMetrics pcMetrics;
Expand Down Expand Up @@ -302,7 +303,10 @@ private void initMetrics() {
shardsSizeGauge = pcMetrics.gaugeFromMetricDef(PCMetricsDef.SHARDS_SIZE,
this, shardManager -> shardManager.processingShards.values().stream()
.mapToInt(processingShard -> processingShard.getEntries().size()).sum());
shardsMaxSizeGauge = pcMetrics.gaugeFromMetricDef(PCMetricsDef.SHARDS_MAX_SIZE,
this, shardManager -> shardManager.processingShards.values().stream()
.mapToInt(processingShard -> processingShard.getEntries().size()).max().orElse(0));
numberOfShardsGauge = pcMetrics.gaugeFromMetricDef(PCMetricsDef.NUMBER_OF_SHARDS,
this, shardManager -> shardManager.processingShards.keySet().size());
this, shardManager -> shardManager.processingShards.size());
}
}