[NIFI-6716] Prometheus Metrics Server returns 500 when a Remote Process Group used

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.10.0
• Component/s: Extensions
• Labels: monitoring
• Assignee: Kotaro Terada
• Reporter: Kotaro Terada
• Created: 26/Sep/19 10:10
• Updated: 03/Oct/19 09:57
• Resolved: 03/Oct/19 09:08

Description

Prometheus Metrics Server returns 500 (Internal Server Error) when a Remote Process Group is used. The error message:

java.lang.IllegalArgumentException: Incorrect number of labels.
at io.prometheus.client.SimpleCollector.labels(SimpleCollector.java:64)
at org.apache.nifi.reporting.prometheus.api.PrometheusMetricsUtil.createNifiMetrics(PrometheusMetricsUtil.java:405)
at org.apache.nifi.reporting.prometheus.PrometheusServer$MetricsServlet.doGet(PrometheusServer.java:74)

Just because the labels number of `ACTIVE_REMOTE_PORT_COUNT`, `INACTIVE_REMOTE_PORT_COUNT`, and `AVERAGE_LINEAGE_DURATION` are unmatched.

Issue Links

• links to: GitHub Pull Request #3767