[Feature] Drop InfluxDB support for metrics storage

[317787106]

Summary

java-tron currently maintains two parallel monitoring systems: Prometheus and MetricsUtil + InfluxDB, leading to fragmented metrics and high maintenance cost. It is proposed to remove InfluxDB storage and standardize on Prometheus as the unified monitoring interface, reducing system complexity and improving observability.

Problem

Motivation

Real-time monitoring is critical for operating and maintaining java-tron nodes. A standard FullNode needs to monitor synchronization status (block height, lag) and API availability; SR nodes additionally need to track missed blocks, block production stability, and latency. The coexistence of two monitoring systems leads to resource waste and cognitive overhead for users.

Current State

java-tron currently provides two mechanisms for exposing monitoring metrics:

Prometheus Mode (mainstream)

• Exposes metrics via /metrics (default: localhost:8545)
• External systems (Prometheus + Grafana) handle collection, storage, visualization, and alerting
• Implementation located at: org.tron.common.prometheus

MetricsUtil + InfluxDB Mode (legacy)

• Uses io.dropwizard.metrics:metrics-core to collect metrics
• Exposes metrics via HTTP endpoint /wallet/monitor/getstatsinfo (default: localhost:8090)
• Supports periodic writes to InfluxDB
• Implementation located at: org.tron.core.metrics.MetricsUtil

Limitations or Risks

1. Fragmented metrics system: Two parallel systems result in inconsistent metric definitions, increasing development, maintenance, and user understanding costs
2. Insufficient granularity in MetricsUtil: Incomplete coverage (missing dimensions such as chain sync, network, DB, JVM), coarse granularity, and lack of labels, making it unsuitable for fine-grained monitoring (per-peer, per-API), performance bottleneck analysis, and alerting
3. Limited applicability of InfluxDB: Isolated from the Prometheus ecosystem, requires additional deployment, increases operational complexity, lacks mature dashboards and alerting rules, and has low adoption in the community
4. Unclear responsibility boundaries: MetricsUtil + InfluxDB acts as a lightweight data sink, blurring the boundary between monitoring metrics (system behavior description) and business data storage

Proposed Solution

Proposed Design

Streamline and simplify the java-tron monitoring system in three steps:

1. Remove InfluxDB storage: Remove InfluxDB storage from MetricsUtil, stop maintaining related configuration, and enforce separation between monitoring and business data

2. Standardize on Prometheus as the monitoring interface: Continue improving metrics coverage across dimensions, such as [Feature] Add Prometheus metrics for empty blocks and SR set changes #6590; the community can refer to the existing implementation in tron-docker

Key Changes

• Affected Modules: org.tron.core.metrics.MetricsUtil (remove InfluxDB reporter logic)
• Config Changes: Remove InfluxDB-related configuration completely :

  # influxdb metrics
  storageEnable = false # Whether write metrics data into InfluxDb. Default: false.
  influxdb {
    ip = ""
    port = 8086
    database = ""
    metricsReportInterval = 10
  }

• API Changes: /wallet/monitor/getstatsinfo remains but is downgraded to an auxiliary interface and no longer recommended as the primary monitoring endpoint

Impact

• Stability: Removing InfluxDB write logic reduces external dependencies and lowers the risk of node instability caused by InfluxDB connectivity issues
• Developer Experience: Unifies the monitoring interface and reduces cognitive overhead; the community can directly reuse Grafana dashboards and alerting rules from tron-docker, avoiding duplicated effort

Backward Compatibility

• Breaking Change: Yes — InfluxDB storage for metrics will be removed
• Default Behavior Change: Nodes using InfluxDB will no longer have this functionality after upgrade
• Migration Required: Yes — Migration documentation (InfluxDB → Prometheus) will be provided; users are encouraged to adopt the tron-docker solution. InfluxDB will be marked as deprecated for one or more release cycles before complete removal

References

• tron-docker metric_monitor

Additional Notes

• Do you have ideas regarding implementation?
  Yes
• Are you willing to implement this feature?
  Yes