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‎README-INFRA-METRICS.md‎

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# TRON Prometheus Infrastructure Metrics
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**PR for [java-tron Issue #6590](https://github.com/tronprotocol/java-tron/issues/6590)** |
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**Penn Blockchain Conference Hackathon 2026 — TRON Bounty 2**
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---
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## What This PR Does
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Adds two new Prometheus counters to java-tron's metrics system, enabling node operators to monitor chain health events that are otherwise invisible at the metrics layer.
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## New Metrics Reference
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| Metric Name | Type | Labels | Description |
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|-------------|------|--------|-------------|
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| `tron:block_empty_total` | Counter | `type="empty"` | Increments each time a block with zero transactions is applied to the chain |
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| `tron:sr_set_change_total` | Counter | `witness`, `change_type` | Increments when the Super Representative set changes during a maintenance period |
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### Label Values for `tron:sr_set_change_total`
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| Label | Value | Description |
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|-------|-------|-------------|
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| `change_type` | `added` | A new SR entered the active set |
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| `change_type` | `removed` | An existing SR left the active set |
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| `witness` | hex address | The SR address affected |
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## Setup Instructions
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### Enable Prometheus Metrics
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In your node's `config.conf`:
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```hocon
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node {
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metricsPrometheusEnable = true
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}
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```
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Or via CLI flag:
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```bash
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java -jar FullNode.jar --metrics-prometheus-enable
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```
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### Prometheus Endpoint
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When enabled, metrics are available at:
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```
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http://localhost:9527/metrics
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```
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### Prometheus Configuration
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Add to your `prometheus.yml`:
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```yaml
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scrape_configs:
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- job_name: 'tron-node'
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static_configs:
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- targets: ['localhost:9527']
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metrics_path: '/metrics'
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```
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## PromQL Example Queries
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### Empty Block Rate (per minute)
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```promql
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rate(tron:block_empty_total[1m])
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```
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### Total Empty Blocks
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```promql
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tron:block_empty_total
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```
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### SR Set Changes Over Time
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```promql
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rate(tron:sr_set_change_total[5m])
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```
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### SRs Added vs Removed
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```promql
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# Added
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sum by (change_type) (tron:sr_set_change_total{change_type="added"})
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# Removed
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sum by (change_type) (tron:sr_set_change_total{change_type="removed"})
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```
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### Alert: High Empty Block Rate
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```promql
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rate(tron:block_empty_total[5m]) > 10
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```
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### Alert: SR Set Changed
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```promql
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increase(tron:sr_set_change_total[1h]) > 0
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```
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## Files Modified
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| File | Change |
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|------|--------|
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| `common/src/main/java/org/tron/common/prometheus/MetricKeys.java` | Added `BLOCK_EMPTY` and `SR_SET_CHANGE` constants |
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| `common/src/main/java/org/tron/common/prometheus/MetricLabels.java` | Added `BLOCK_EMPTY`, `SR_ADDED`, `SR_REMOVED` label value constants |
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| `common/src/main/java/org/tron/common/prometheus/MetricsCounter.java` | Registered both counters with Prometheus |
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| `framework/src/main/java/org/tron/core/metrics/blockchain/BlockChainMetricManager.java` | Added empty block and SR set change detection in `applyBlock()` |
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| `framework/src/test/java/org/tron/core/metrics/prometheus/PrometheusApiServiceTest.java` | Added `testEmptyBlockMetric()` and `testSrSetChangeMetric()` tests |
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## Build & Test Commands
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```bash
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# Build without tests (fast)
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./gradlew clean build -x test
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# Compile modified source
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./gradlew :framework:compileJava :common:compileJava
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# Run Prometheus metric tests only
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./gradlew :framework:test --tests \
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"org.tron.core.metrics.prometheus.PrometheusApiServiceTest"
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# Run all metrics tests
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./gradlew :framework:test --tests "org.tron.core.metrics.*"
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# Full test suite
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./gradlew test
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# Coverage report
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./gradlew :framework:jacocoTestReport
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# Report: framework/build/reports/jacoco/test/html/index.html
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```
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## Implementation Details
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### Empty Block Detection
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In `BlockChainMetricManager.applyBlock()`, after the existing TPS counter logic:
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```java
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if (block.getTransactions().isEmpty()) {
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Metrics.counterInc(MetricKeys.Counter.BLOCK_EMPTY, 1,
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MetricLabels.Counter.BLOCK_EMPTY);
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}
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```
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### SR Set Change Detection
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Compares the current active witness list against the previous set, emitting `added` and `removed` labels for each diff:
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```java
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List<ByteString> currentSrList =
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chainBaseManager.getWitnessScheduleStore().getActiveWitnesses();
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Set<String> currentSrSet = currentSrList.stream()
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.map(bs -> Hex.toHexString(bs.toByteArray()))
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.collect(Collectors.toSet());
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if (!previousSrSet.isEmpty() && !currentSrSet.equals(previousSrSet)) {
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for (String sr : Sets.difference(currentSrSet, previousSrSet)) {
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Metrics.counterInc(MetricKeys.Counter.SR_SET_CHANGE, 1,
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sr, MetricLabels.Counter.SR_ADDED);
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}
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for (String sr : Sets.difference(previousSrSet, currentSrSet)) {
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Metrics.counterInc(MetricKeys.Counter.SR_SET_CHANGE, 1,
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sr, MetricLabels.Counter.SR_REMOVED);
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}
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}
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previousSrSet = currentSrSet;
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```
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### Code Style
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- Purely additive — zero protocol changes, zero API changes, zero backward compatibility issues
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- Uses existing `Metrics.counterInc()` pattern throughout
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- All constants defined in `MetricKeys.java` and `MetricLabels.java` (no hardcoded strings)
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- Java 8 compatible (no lambdas, no records)
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- No new Gradle dependencies
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## Related Issues
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- [java-tron #6590](https://github.com/tronprotocol/java-tron/issues/6590) — Prometheus metrics for empty blocks and SR changes

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