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Fix rejection ratio alert #508

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merged 2 commits into from
Nov 29, 2024
+17 −4
Merged

Fix rejection ratio alert #508

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caba62b
Fix rejection ratio alert
gabrielcocenza Nov 27, 2024
433be1e
Fix denominator to include all write operations on thread pool
gabrielcocenza Nov 29, 2024
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21 changes: 17 additions & 4 deletions src/alert_rules/prometheus/prometheus_alerts.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,19 @@
- "name": "opensearch.alerts"
"rules":

# Write requests rates
# =====================
- record: write:rejected_requests:rate2m
expr: sum by (cluster, instance, node) (rate(opensearch_threadpool_threads_count{name="write", type="rejected"}[2m]))

- record: write:total_requests:rate2m
expr: sum by (cluster, instance, node) (rate(opensearch_threadpool_threads_count{name="write"}[2m]))

# If there are no write rejections then we get can 0/0 which is NaN. This does not affect the
# OpenSearchWriteRequestsRejectionJumps alert
- record: write:reject_ratio:rate2m
expr: write:rejected_requests:rate2m / write:total_requests:rate2m

- "alert": "OpenSearchScrapeFailed"
"annotations":
"message": "Scrape on {{ $labels.juju_unit }} failed. Ensure that the OpenSearch systemd service is healthy and that the unit is part of the cluster."
Expand Down Expand Up @@ -32,12 +45,12 @@
"labels":
"severity": "warning"

- "alert": "OpenSearchBulkRequestsRejectionJumps"
- "alert": "OpenSearchWriteRequestsRejectionJumps"
"annotations":
"message": "High Bulk Rejection Ratio at {{ $labels.node }} node in {{ $labels.cluster }} cluster. This node may not be keeping up with the indexing speed."
"summary": "High Bulk Rejection Ratio - {{ $value }}%"
"message": "High Write Rejection Ratio at {{ $labels.node }} node in {{ $labels.cluster }} cluster. This node may not be keeping up with the indexing speed."
"summary": "High Write Rejection Ratio - {{ $value }}%"
"expr": |
round( bulk:reject_ratio:rate2m * 100, 0.001 ) > 5
round( write:reject_ratio:rate2m * 100, 0.001 ) > 5
"for": "10m"
"labels":
"severity": "warning"
Expand Down
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