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{
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"annotations": {"list": []},
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"description": "NVMe throughput, latency and temperature per node. Every panel joins node_disk_* to node_nvme_info and node_uname_info on purpose: device names are NOT stable across nodes (nvme0 is the Kingston system disk on k8s-1 and k8s-3, but the Crucial on k8s-2), so a legend keyed on the device alone compares different hardware. Endurance/wear is deliberately absent — see the note at the bottom and issue #549.",
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"editable": true,
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"fiscalYearStartMonth": 0,
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"graphTooltip": 1,
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"id": null,
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"links": [],
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"panels": [
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{
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"datasource": {"type": "prometheus", "uid": "prometheus"},
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"description": "Which physical drive is which, resolved live rather than written down. The OSD column comes from ceph_disk_occupation, so it follows Rook instead of restating a device list that would go stale the next time a drive is swapped.",
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"fieldConfig": {
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"defaults": {
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"color": {"mode": "thresholds"},
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"custom": {"align": "auto", "cellOptions": {"type": "auto"}, "inspect": false},
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"mappings": [],
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"thresholds": {"mode": "absolute", "steps": [{"color": "text", "value": null}]}
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},
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"overrides": []
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},
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"gridPos": {"h": 9, "w": 24, "x": 0, "y": 0},
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"id": 1,
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"options": {"cellHeight": "sm", "footer": {"countRows": false, "fields": "", "reducer": ["sum"], "show": false}, "showHeader": true, "sortBy": [{"desc": false, "displayName": "node"}]},
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"targets": [
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{
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"datasource": {"type": "prometheus", "uid": "prometheus"},
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"expr": "node_nvme_info * on (instance) group_left(nodename) node_uname_info",
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"format": "table",
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"instant": true,
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"legendFormat": "",
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"refId": "A"
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}
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],
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"title": "Drive inventory",
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"transformations": [
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{
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"id": "organize",
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"options": {
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"excludeByName": {"Time": true, "Value": true, "__name__": true, "cntlid": true, "container": true, "endpoint": true, "instance": true, "job": true, "namespace": true, "pod": true, "service": true, "domainname": true, "machine": true, "release": true, "sysname": true, "version": true, "state": true},
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"indexByName": {},
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"renameByName": {"nodename": "node", "device": "device", "model": "model", "serial": "serial", "firmware_revision": "firmware"}
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}
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}
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],
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"type": "table"
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},
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{
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"datasource": {"type": "prometheus", "uid": "prometheus"},
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"description": "Read and write throughput per drive.",
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"fieldConfig": {
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"defaults": {
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"color": {"mode": "palette-classic"},
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"custom": {"axisCenteredZero": false, "axisColorMode": "text", "axisPlacement": "auto", "barAlignment": 0, "drawStyle": "line", "fillOpacity": 10, "gradientMode": "none", "hideFrom": {"legend": false, "tooltip": false, "viz": false}, "lineInterpolation": "smooth", "lineWidth": 2, "pointSize": 5, "scaleDistribution": {"type": "linear"}, "showPoints": "never", "spanNulls": false, "stacking": {"group": "A", "mode": "none"}, "thresholdsStyle": {"mode": "off"}},
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"mappings": [],
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"thresholds": {"mode": "absolute", "steps": [{"color": "green", "value": null}]},
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"unit": "Bps"
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},
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"overrides": []
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},
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"gridPos": {"h": 9, "w": 12, "x": 0, "y": 9},
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"id": 2,
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"options": {"legend": {"calcs": ["mean", "max"], "displayMode": "table", "placement": "bottom", "showLegend": true}, "tooltip": {"mode": "multi", "sort": "desc"}},
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"targets": [
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{
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"datasource": {"type": "prometheus", "uid": "prometheus"},
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"expr": "label_replace(rate(node_disk_read_bytes_total{device=~\"nvme[0-9]+n[0-9]+\"}[$__rate_interval]), \"nvmedev\", \"$1\", \"device\", \"(nvme[0-9]+)n[0-9]+\") * on (instance, nvmedev) group_left(model) label_replace(node_nvme_info, \"nvmedev\", \"$1\", \"device\", \"(nvme[0-9]+)\") * on (instance) group_left(nodename) node_uname_info",
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"legendFormat": "read {{nodename}} {{model}}",
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"refId": "A"
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},
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{
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"datasource": {"type": "prometheus", "uid": "prometheus"},
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"expr": "label_replace(rate(node_disk_written_bytes_total{device=~\"nvme[0-9]+n[0-9]+\"}[$__rate_interval]), \"nvmedev\", \"$1\", \"device\", \"(nvme[0-9]+)n[0-9]+\") * on (instance, nvmedev) group_left(model) label_replace(node_nvme_info, \"nvmedev\", \"$1\", \"device\", \"(nvme[0-9]+)\") * on (instance) group_left(nodename) node_uname_info",
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"legendFormat": "write {{nodename}} {{model}}",
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"refId": "B"
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}
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],
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"title": "Throughput",
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"type": "timeseries"
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},
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{
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"datasource": {"type": "prometheus", "uid": "prometheus"},
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"description": "Completed operations per second. Read together with throughput this separates many small operations from few large ones.",
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"fieldConfig": {
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"defaults": {
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"color": {"mode": "palette-classic"},
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"custom": {"axisCenteredZero": false, "axisColorMode": "text", "axisPlacement": "auto", "barAlignment": 0, "drawStyle": "line", "fillOpacity": 10, "gradientMode": "none", "hideFrom": {"legend": false, "tooltip": false, "viz": false}, "lineInterpolation": "smooth", "lineWidth": 2, "pointSize": 5, "scaleDistribution": {"type": "linear"}, "showPoints": "never", "spanNulls": false, "stacking": {"group": "A", "mode": "none"}, "thresholdsStyle": {"mode": "off"}},
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"mappings": [],
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"thresholds": {"mode": "absolute", "steps": [{"color": "green", "value": null}]},
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"unit": "iops"
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},
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"overrides": []
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},
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"gridPos": {"h": 9, "w": 12, "x": 12, "y": 9},
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"id": 3,
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"options": {"legend": {"calcs": ["mean", "max"], "displayMode": "table", "placement": "bottom", "showLegend": true}, "tooltip": {"mode": "multi", "sort": "desc"}},
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"targets": [
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{
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"datasource": {"type": "prometheus", "uid": "prometheus"},
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"expr": "label_replace(rate(node_disk_reads_completed_total{device=~\"nvme[0-9]+n[0-9]+\"}[$__rate_interval]), \"nvmedev\", \"$1\", \"device\", \"(nvme[0-9]+)n[0-9]+\") * on (instance, nvmedev) group_left(model) label_replace(node_nvme_info, \"nvmedev\", \"$1\", \"device\", \"(nvme[0-9]+)\") * on (instance) group_left(nodename) node_uname_info",
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"legendFormat": "read {{nodename}} {{model}}",
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"refId": "A"
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},
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{
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"datasource": {"type": "prometheus", "uid": "prometheus"},
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"expr": "label_replace(rate(node_disk_writes_completed_total{device=~\"nvme[0-9]+n[0-9]+\"}[$__rate_interval]), \"nvmedev\", \"$1\", \"device\", \"(nvme[0-9]+)n[0-9]+\") * on (instance, nvmedev) group_left(model) label_replace(node_nvme_info, \"nvmedev\", \"$1\", \"device\", \"(nvme[0-9]+)\") * on (instance) group_left(nodename) node_uname_info",
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"legendFormat": "write {{nodename}} {{model}}",
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"refId": "B"
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}
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],
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"title": "IOPS",
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"type": "timeseries"
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},
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{
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"datasource": {"type": "prometheus", "uid": "prometheus"},
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"description": "Mean service time per operation, derived as accumulated time divided by completed operations. This is an average and will not show a tail — a drive can look healthy here while a small fraction of operations stall. The line disappears while a device is idle, because the denominator is zero; that is absence of traffic, not absence of a problem.",
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"fieldConfig": {
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"defaults": {
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"color": {"mode": "palette-classic"},
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"custom": {"axisCenteredZero": false, "axisColorMode": "text", "axisPlacement": "auto", "barAlignment": 0, "drawStyle": "line", "fillOpacity": 10, "gradientMode": "none", "hideFrom": {"legend": false, "tooltip": false, "viz": false}, "lineInterpolation": "smooth", "lineWidth": 2, "pointSize": 5, "scaleDistribution": {"type": "linear"}, "showPoints": "never", "spanNulls": false, "stacking": {"group": "A", "mode": "none"}, "thresholdsStyle": {"mode": "off"}},
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"mappings": [],
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"thresholds": {"mode": "absolute", "steps": [{"color": "green", "value": null}]},
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"unit": "s"
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},
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"overrides": []
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},
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"gridPos": {"h": 9, "w": 12, "x": 0, "y": 18},
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"id": 4,
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"options": {"legend": {"calcs": ["mean", "max"], "displayMode": "table", "placement": "bottom", "showLegend": true}, "tooltip": {"mode": "multi", "sort": "desc"}},
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"targets": [
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{
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"datasource": {"type": "prometheus", "uid": "prometheus"},
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"expr": "label_replace(rate(node_disk_read_time_seconds_total{device=~\"nvme[0-9]+n[0-9]+\"}[$__rate_interval]) / rate(node_disk_reads_completed_total{device=~\"nvme[0-9]+n[0-9]+\"}[$__rate_interval]), \"nvmedev\", \"$1\", \"device\", \"(nvme[0-9]+)n[0-9]+\") * on (instance, nvmedev) group_left(model) label_replace(node_nvme_info, \"nvmedev\", \"$1\", \"device\", \"(nvme[0-9]+)\") * on (instance) group_left(nodename) node_uname_info",
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"legendFormat": "read {{nodename}} {{model}}",
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"refId": "A"
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},
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{
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"datasource": {"type": "prometheus", "uid": "prometheus"},
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"expr": "label_replace(rate(node_disk_write_time_seconds_total{device=~\"nvme[0-9]+n[0-9]+\"}[$__rate_interval]) / rate(node_disk_writes_completed_total{device=~\"nvme[0-9]+n[0-9]+\"}[$__rate_interval]), \"nvmedev\", \"$1\", \"device\", \"(nvme[0-9]+)n[0-9]+\") * on (instance, nvmedev) group_left(model) label_replace(node_nvme_info, \"nvmedev\", \"$1\", \"device\", \"(nvme[0-9]+)\") * on (instance) group_left(nodename) node_uname_info",
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"legendFormat": "write {{nodename}} {{model}}",
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"refId": "B"
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}
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],
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"title": "Mean operation latency",
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"type": "timeseries"
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},
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{
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"datasource": {"type": "prometheus", "uid": "prometheus"},
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"description": "Fraction of wall-clock time the device had at least one operation in flight, and the number of operations queued. Utilisation near 100% on an NVMe drive does not mean saturation the way it does on a spindle — these devices serve many operations in parallel — so read it alongside the queue depth.",
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"fieldConfig": {
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"defaults": {
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"color": {"mode": "palette-classic"},
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"custom": {"axisCenteredZero": false, "axisColorMode": "text", "axisPlacement": "auto", "barAlignment": 0, "drawStyle": "line", "fillOpacity": 10, "gradientMode": "none", "hideFrom": {"legend": false, "tooltip": false, "viz": false}, "lineInterpolation": "smooth", "lineWidth": 2, "pointSize": 5, "scaleDistribution": {"type": "linear"}, "showPoints": "never", "spanNulls": false, "stacking": {"group": "A", "mode": "none"}, "thresholdsStyle": {"mode": "off"}},
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"mappings": [],
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"thresholds": {"mode": "absolute", "steps": [{"color": "green", "value": null}]},
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"unit": "percentunit"
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},
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"overrides": [
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{
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"matcher": {"id": "byRegexp", "options": "queue .*"},
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"properties": [{"id": "unit", "value": "short"}, {"id": "custom.axisPlacement", "value": "right"}]
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}
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]
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},
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"gridPos": {"h": 9, "w": 12, "x": 12, "y": 18},
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"id": 5,
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"options": {"legend": {"calcs": ["mean", "max"], "displayMode": "table", "placement": "bottom", "showLegend": true}, "tooltip": {"mode": "multi", "sort": "desc"}},
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"targets": [
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{
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"datasource": {"type": "prometheus", "uid": "prometheus"},
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"expr": "label_replace(rate(node_disk_io_time_seconds_total{device=~\"nvme[0-9]+n[0-9]+\"}[$__rate_interval]), \"nvmedev\", \"$1\", \"device\", \"(nvme[0-9]+)n[0-9]+\") * on (instance, nvmedev) group_left(model) label_replace(node_nvme_info, \"nvmedev\", \"$1\", \"device\", \"(nvme[0-9]+)\") * on (instance) group_left(nodename) node_uname_info",
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"legendFormat": "busy {{nodename}} {{model}}",
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"refId": "A"
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},
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{
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"datasource": {"type": "prometheus", "uid": "prometheus"},
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"expr": "label_replace(node_disk_io_now{device=~\"nvme[0-9]+n[0-9]+\"}, \"nvmedev\", \"$1\", \"device\", \"(nvme[0-9]+)n[0-9]+\") * on (instance, nvmedev) group_left(model) label_replace(node_nvme_info, \"nvmedev\", \"$1\", \"device\", \"(nvme[0-9]+)\") * on (instance) group_left(nodename) node_uname_info",
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"legendFormat": "queue {{nodename}} {{model}}",
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"refId": "B"
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}
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],
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"title": "Utilisation and queue depth",
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"type": "timeseries"
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},
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{
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"datasource": {"type": "prometheus", "uid": "prometheus"},
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"description": "Composite temperature reported by each controller, read from hwmon in sysfs. This is the one health value available without an admin ioctl, which is why it is the only SMART-adjacent series on this dashboard.",
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"fieldConfig": {
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"defaults": {
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"color": {"mode": "palette-classic"},
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"custom": {"axisCenteredZero": false, "axisColorMode": "text", "axisPlacement": "auto", "barAlignment": 0, "drawStyle": "line", "fillOpacity": 10, "gradientMode": "none", "hideFrom": {"legend": false, "tooltip": false, "viz": false}, "lineInterpolation": "smooth", "lineWidth": 2, "pointSize": 5, "scaleDistribution": {"type": "linear"}, "showPoints": "never", "spanNulls": false, "stacking": {"group": "A", "mode": "none"}, "thresholdsStyle": {"mode": "dashed"}},
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"mappings": [],
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"thresholds": {"mode": "absolute", "steps": [{"color": "green", "value": null}, {"color": "orange", "value": 70}, {"color": "red", "value": 80}]},
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"unit": "celsius"
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},
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"overrides": []
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},
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"gridPos": {"h": 9, "w": 12, "x": 0, "y": 27},
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"id": 6,
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"options": {"legend": {"calcs": ["mean", "max"], "displayMode": "table", "placement": "bottom", "showLegend": true}, "tooltip": {"mode": "multi", "sort": "desc"}},
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"targets": [
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{
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"datasource": {"type": "prometheus", "uid": "prometheus"},
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"expr": "label_replace(node_hwmon_temp_celsius{chip=~\"nvme_nvme[0-9]+\", sensor=\"temp1\"}, \"nvmedev\", \"$1\", \"chip\", \"nvme_(nvme[0-9]+)\") * on (instance, nvmedev) group_left(model) label_replace(node_nvme_info, \"nvmedev\", \"$1\", \"device\", \"(nvme[0-9]+)\") * on (instance) group_left(nodename) node_uname_info",
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"legendFormat": "{{nodename}} {{model}}",
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"refId": "A"
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}
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],
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"title": "Controller temperature",
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"type": "timeseries"
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},
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{
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"datasource": {"type": "prometheus", "uid": "prometheus"},
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"description": "Ceph's own view of the OSDs, for comparison with the block-layer numbers above. A divergence between these and the device latency is the interesting case: it points at Ceph rather than at the hardware.",
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"fieldConfig": {
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"defaults": {
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"color": {"mode": "palette-classic"},
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"custom": {"axisCenteredZero": false, "axisColorMode": "text", "axisPlacement": "auto", "barAlignment": 0, "drawStyle": "line", "fillOpacity": 10, "gradientMode": "none", "hideFrom": {"legend": false, "tooltip": false, "viz": false}, "lineInterpolation": "smooth", "lineWidth": 2, "pointSize": 5, "scaleDistribution": {"type": "linear"}, "showPoints": "never", "spanNulls": false, "stacking": {"group": "A", "mode": "none"}, "thresholdsStyle": {"mode": "off"}},
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"mappings": [],
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"thresholds": {"mode": "absolute", "steps": [{"color": "green", "value": null}]},
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"unit": "ms"
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},
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"overrides": []
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},
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"gridPos": {"h": 9, "w": 12, "x": 12, "y": 27},
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"id": 7,
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"options": {"legend": {"calcs": ["mean", "max"], "displayMode": "table", "placement": "bottom", "showLegend": true}, "tooltip": {"mode": "multi", "sort": "desc"}},
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"targets": [
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{
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"datasource": {"type": "prometheus", "uid": "prometheus"},
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"expr": "ceph_osd_apply_latency_ms",
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"legendFormat": "apply {{ceph_daemon}}",
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"refId": "A"
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},
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{
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"datasource": {"type": "prometheus", "uid": "prometheus"},
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"expr": "ceph_osd_commit_latency_ms",
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"legendFormat": "commit {{ceph_daemon}}",
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"refId": "B"
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}
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],
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"title": "Ceph OSD latency",
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"type": "timeseries"
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},
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{
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"datasource": {"type": "prometheus", "uid": "prometheus"},
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"gridPos": {"h": 8, "w": 24, "x": 0, "y": 36},
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"id": 8,
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"options": {
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"code": {"language": "plaintext", "showLineNumbers": false, "showMiniMap": false},
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"content": "### What this dashboard cannot tell you\n\n**Endurance is missing.** There is no wear, no written-bytes total, no power-on hours and no media-error count here, because no exporter in this cluster produces them. NVMe reports those over an admin ioctl that needs elevated privileges, and temperature is the only health value the kernel publishes through sysfs. Tracked as **#549** — do not read a healthy dashboard as a healthy drive.\n\n**The three roles are not interchangeable.** Each node carries a Kingston OM8PGP41024Q as the Talos system disk, a Samsung PM983 that Rook claims as the Ceph OSD, and a Crucial P3 that was retired from Ceph and now carries the EPHEMERAL volume. The Crucial drives were replaced *because* they were worn, so the drive with the least endurance left is the one holding container state — and it is the one nothing is watching.\n\n**Device names are not identity.** `nvme0` is the Kingston on k8s-1 and k8s-3 and the Crucial on k8s-2. Every panel here resolves the model through `node_nvme_info` for that reason; a query written against a bare device name compares different hardware and will keep doing so silently.",
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"mode": "markdown"
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},
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"title": "Gaps and caveats",
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"type": "text"
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}
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],
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"preload": false,
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"refresh": "1m",
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"schemaVersion": 39,
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"tags": ["storage", "nvme", "ceph"],
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"templating": {"list": []},
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"time": {"from": "now-6h", "to": "now"},
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"timepicker": {},
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"timezone": "",
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"title": "Disk Health",
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"uid": "disk-health",
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"version": 1,
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"weekStart": ""
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}
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claude-botandClaude Opus 5
k.renner