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dashboards: Add Fsync avg duration panel to Troubleshooting section #1636

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22843dd
dashboards: Add Fsync avg duration panel to Troubleshooting section
makasim Jul 28, 2026
a3659d3
add changelog
makasim Jul 28, 2026
c57cae7
fix datasource
makasim Jul 28, 2026
249f64d
fix datasource
makasim Jul 28, 2026
6840a7f
update
func25 Jul 29, 2026
623cce3
update
func25 Jul 29, 2026
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104 changes: 104 additions & 0 deletions dashboards/victorialogs-cluster.json
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -4422,6 +4422,110 @@
],
"title": "Streams churn rate 24h",
"type": "timeseries"
},
{
"datasource": {
"type": "prometheus",
"uid": "$DS_PROMETHEUS"
},
"description": "Average duration of fsync system calls. Spikes or high latency indicates that storage I/O cannot keep up with the write rate, which may slow down data ingestion.\n\nIf this value is elevated:\n- Check disk-related metrics.\n- If using cloud storage, check IOPS and throughput limits.\n- If using NFS, check network performance, server resource usage, and any errors on the NFS server side.\n- Check for known bugs in the filesystem or kernel version being used.",
"fieldConfig": {
"defaults": {
"color": {
"mode": "palette-classic"
},
"custom": {
"axisBorderShow": false,
"axisCenteredZero": false,
"axisColorMode": "text",
"axisLabel": "",
"axisPlacement": "auto",
"axisSoftMin": 0,
"barAlignment": 0,
"barWidthFactor": 0.6,
"drawStyle": "line",
"fillOpacity": 0,
"gradientMode": "none",
"hideFrom": {
"legend": false,
"tooltip": false,
"viz": false
},
"insertNulls": false,
"lineInterpolation": "linear",
"lineWidth": 1,
"pointSize": 5,
"scaleDistribution": {
"type": "linear"
},
"showPoints": "never",
"showValues": false,
"spanNulls": false,
"stacking": {
"group": "A",
"mode": "none"
},
"thresholdsStyle": {
"mode": "off"
}
},
"links": [],
"mappings": [],
"thresholds": {
"mode": "absolute",
"steps": [
{
"color": "green",
"value": 0
}
]
},
"unit": "s"
},
"overrides": []
},
"gridPos": {
"h": 8,
"w": 12,
"x": 0,
"y": 124
},
"id": 159,
"options": {
"legend": {
"calcs": [
"lastNotNull",
"max"
],
"displayMode": "table",
"placement": "bottom",
"showLegend": true,
"sortBy": "Last *",
"sortDesc": true
},
"tooltip": {
"hideZeros": true,
"mode": "multi",
"sort": "desc"
}
},
"pluginVersion": "12.4.3",
"targets": [
{
"datasource": {
"type": "prometheus",
"uid": "$ds"
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},
"editorMode": "code",
"expr": "rate(vm_filestream_fsync_duration_seconds_total{job=~\"$job\", instance=~\"$instance\"}[$__rate_interval]) / rate(vm_filestream_fsync_calls_total{job=~\"$job\", instance=~\"$instance\"}[$__rate_interval])",
"format": "time_series",
"instant": false,
"legendFormat": "{{instance}}",
"refId": "A"
}
],
"title": "Fsync avg duration ($instance)",
"type": "timeseries"
}
],
"title": "Troubleshooting",
Expand Down
104 changes: 104 additions & 0 deletions dashboards/victorialogs.json
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -4236,6 +4236,110 @@
],
"title": "Logs dropped for last 1h",
"type": "timeseries"
},
{
"datasource": {
"type": "prometheus",
"uid": "$DS_PROMETHEUS"
},
"description": "Average duration of fsync system calls. Spikes or high latency indicates that storage I/O cannot keep up with the write rate, which may slow down data ingestion.\n\nIf this value is elevated:\n- Check disk-related metrics.\n- If using cloud storage, check IOPS and throughput limits.\n- If using NFS, check network performance, server resource usage, and any errors on the NFS server side.\n- Check for known bugs in the filesystem or kernel version being used.",
"fieldConfig": {
"defaults": {
"color": {
"mode": "palette-classic"
},
"custom": {
"axisBorderShow": false,
"axisCenteredZero": false,
"axisColorMode": "text",
"axisLabel": "",
"axisPlacement": "auto",
"axisSoftMin": 0,
"barAlignment": 0,
"barWidthFactor": 0.6,
"drawStyle": "line",
"fillOpacity": 0,
"gradientMode": "none",
"hideFrom": {
"legend": false,
"tooltip": false,
"viz": false
},
"insertNulls": false,
"lineInterpolation": "linear",
"lineWidth": 1,
"pointSize": 5,
"scaleDistribution": {
"type": "linear"
},
"showPoints": "never",
"showValues": false,
"spanNulls": false,
"stacking": {
"group": "A",
"mode": "none"
},
"thresholdsStyle": {
"mode": "off"
}
},
"links": [],
"mappings": [],
"thresholds": {
"mode": "absolute",
"steps": [
{
"color": "green",
"value": 0
}
]
},
"unit": "s"
},
"overrides": []
},
"gridPos": {
"h": 8,
"w": 12,
"x": 0,
"y": 124
},
"id": 159,
"options": {
"legend": {
"calcs": [
"lastNotNull",
"max"
],
"displayMode": "table",
"placement": "bottom",
"showLegend": true,
"sortBy": "Last *",
"sortDesc": true
},
"tooltip": {
"hideZeros": true,
"mode": "multi",
"sort": "desc"
}
},
"pluginVersion": "12.4.3",
"targets": [
{
"datasource": {
"type": "prometheus",
"uid": "$ds"
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},
"editorMode": "code",
"expr": "rate(vm_filestream_fsync_duration_seconds_total{job=~\"$job\", instance=~\"$instance\"}[$__rate_interval]) / rate(vm_filestream_fsync_calls_total{job=~\"$job\", instance=~\"$instance\"}[$__rate_interval])",
"format": "time_series",
"instant": false,
"legendFormat": "{{instance}}",
"refId": "A"
}
],
"title": "Fsync avg duration ($instance)",
"type": "timeseries"
}
],
"title": "Troubleshooting",
Expand Down
104 changes: 104 additions & 0 deletions dashboards/vlagent.json
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -3808,6 +3808,110 @@
],
"title": "Restarts ($job)",
"type": "timeseries"
},
{
"datasource": {
"type": "prometheus",
"uid": "$DS_PROMETHEUS"
},
"description": "Average duration of fsync system calls. Spikes or high latency indicates that storage I/O cannot keep up with the write rate, which may slow down data ingestion.\n\nIf this value is elevated:\n- Check disk-related metrics.\n- If using cloud storage, check IOPS and throughput limits.\n- If using NFS, check network performance, server resource usage, and any errors on the NFS server side.\n- Check for known bugs in the filesystem or kernel version being used.",
"fieldConfig": {
"defaults": {
"color": {
"mode": "palette-classic"
},
"custom": {
"axisBorderShow": false,
"axisCenteredZero": false,
"axisColorMode": "text",
"axisLabel": "",
"axisPlacement": "auto",
"axisSoftMin": 0,
"barAlignment": 0,
"barWidthFactor": 0.6,
"drawStyle": "line",
"fillOpacity": 0,
"gradientMode": "none",
"hideFrom": {
"legend": false,
"tooltip": false,
"viz": false
},
"insertNulls": false,
"lineInterpolation": "linear",
"lineWidth": 1,
"pointSize": 5,
"scaleDistribution": {
"type": "linear"
},
"showPoints": "never",
"showValues": false,
"spanNulls": false,
"stacking": {
"group": "A",
"mode": "none"
},
"thresholdsStyle": {
"mode": "off"
}
},
"links": [],
"mappings": [],
"thresholds": {
"mode": "absolute",
"steps": [
{
"color": "green",
"value": 0
}
]
},
"unit": "s"
},
"overrides": []
},
"gridPos": {
"h": 8,
"w": 12,
"x": 0,
"y": 124
},
"id": 159,
"options": {
"legend": {
"calcs": [
"lastNotNull",
"max"
],
"displayMode": "table",
"placement": "bottom",
"showLegend": true,
"sortBy": "Last *",
"sortDesc": true
},
"tooltip": {
"hideZeros": true,
"mode": "multi",
"sort": "desc"
}
},
"pluginVersion": "12.4.3",
"targets": [
{
"datasource": {
"type": "prometheus",
"uid": "$ds"
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},
"editorMode": "code",
"expr": "rate(vm_filestream_fsync_duration_seconds_total{job=~\"$job\", instance=~\"$instance\"}[$__rate_interval]) / rate(vm_filestream_fsync_calls_total{job=~\"$job\", instance=~\"$instance\"}[$__rate_interval])",
"format": "time_series",
"instant": false,
"legendFormat": "{{instance}}",
"refId": "A"
}
],
"title": "Fsync avg duration ($instance)",
"type": "timeseries"
}
],
"title": "Troubleshooting",
Expand Down
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