Alexander Bij created NIFI-16298:
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Summary: Expose Primary Node and Cluster Coordinator role as
Prometheus metrics
Key: NIFI-16298
URL: https://issues.apache.org/jira/browse/NIFI-16298
Project: Apache NiFi
Issue Type: Improvement
Components: Core Framework
Affects Versions: 2.11.0
Reporter: Alexander Bij
h2. Summary
The Prometheus flow metrics endpoint (\{{/nifi-api/flow/metrics/prometheus}})
exposes cluster membership/connectivity metrics (\{{cluster_is_clustered}},
\{{cluster_is_connected_to_cluster}}, \{{cluster_connected_node_count}},
\{{cluster_total_node_count}}, all in \{{ClusterMetricsRegistry}}), but nothing
indicates which node currently holds the *Primary Node* or *Cluster
Coordinator* role. Building a "nodes in this cluster" dashboard/table (one row
per node, with its key stats) currently has no way to mark which row is the
Primary Node or the Cluster Coordinator without querying NiFi's REST API
separately and joining the data out-of-band.
h2. Why this is useful
To be able to build a Grafana dashboard showing the Primary Node and Cluster
Coordinator directly from the same Prometheus scrape.
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