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feat: add hard-limited presets metric#18008

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evgeniy-scherbina merged 11 commits intomainfrom17988-metric-for-hard-limited-presets
May 26, 2025

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@evgeniy-scherbinaevgeniy-scherbina commentedMay 23, 2025•
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Closes#17988

Definepreset_hard_limited metric which for every preset indicates whether a given preset has reached the hard failure limit (1 for hard-limited, 0 otherwise).

CLI example:

curl -X GET localhost:2118/metrics | grep preset_hard_limited# HELP coderd_prebuilt_workspaces_preset_hard_limited Indicates whether a given preset has reached the hard failure limit (1 for hard-limited, 0 otherwise).# TYPE coderd_prebuilt_workspaces_preset_hard_limited gaugecoderd_prebuilt_workspaces_preset_hard_limited{organization_name="coder",preset_name="GoLand: Large",template_name="Test7"} 1coderd_prebuilt_workspaces_preset_hard_limited{organization_name="coder",preset_name="GoLand: Large",template_name="ValidTemplate"} 0coderd_prebuilt_workspaces_preset_hard_limited{organization_name="coder",preset_name="IU: Medium",template_name="Test7"} 1coderd_prebuilt_workspaces_preset_hard_limited{organization_name="coder",preset_name="IU: Medium",template_name="ValidTemplate"} 0coderd_prebuilt_workspaces_preset_hard_limited{organization_name="coder",preset_name="WS: Small",template_name="Test7"} 1

NOTE:

if!ps.Preset.Deleted&&ps.Preset.UsingActiveVersion {c.metrics.trackHardLimitedStatus(ps.Preset.OrganizationName,ps.Preset.TemplateName,ps.Preset.Name,ps.IsHardLimited)}

Only active template version is tracked. If admin creates new template version - old value of metric (for previous template version) will be overwritten with new value of metric (for active template version).
Becausetemplate_version is not part of metric:

labels= []string{"template_name","preset_name","organization_name"}

Implementation is similar to implementation ofMetricResourceReplacementsCount metric

@evgeniy-scherbinaevgeniy-scherbinaforce-pushed the17988-metric-for-hard-limited-presets branch from39748bd to6fb6800CompareMay 23, 2025 13:44
@evgeniy-scherbinaevgeniy-scherbinaforce-pushed the17988-metric-for-hard-limited-presets branch fromf6ea98b to2667684CompareMay 23, 2025 16:45
@evgeniy-scherbinaevgeniy-scherbina marked this pull request as ready for reviewMay 23, 2025 16:48
@evgeniy-scherbinaevgeniy-scherbinaforce-pushed the17988-metric-for-hard-limited-presets branch from8db12a2 to3100e01CompareMay 23, 2025 23:37

key:=hardLimitedPresetKey{orgName:orgName,templateName:templateName,presetName:presetName}

mc.isPresetHardLimited[key]=isHardLimited
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@ssncferreirassncferreiraMay 26, 2025•
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nit: With this approach, we’re accumulating entries that are no longer relevant over time. This can cause the metrics to keep reporting0 for presets that should disappear (e.g., deleted or outdated presets).

A small improvement would be to remove presets from the map whenisHardLimited == false:

if isHardLimited {mc.isPresetHardLimited[key] = true} else {delete(mc.isPresetHardLimited, key)}

This keeps the metric data cleaner and avoids unnecessary entries in Prometheus.

But there is a catch 🤔 With this change, there’s a brief window where Prometheus may still show the previous value (1) for a preset after it’s been removed from the map. This is expected behavior in Prometheus, metrics are not deleted immediately, but expire after some time without being reported.

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Good catch, fixed here:80c89fe.

I was under a false assumption that it will report stale value indefinitely.

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Overall looks good to me, just a note on the metrics setting: removing entries from the map whenisHardLimited keeps metrics clean and reduce cardinality. The trade-off is that Prometheus will show stale data briefly after removal, since metrics aren’t deleted immediately but expire after some time without being reported. This behavior is expected and I think acceptable in this context.

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LGTM! 🚀 The comments in the tests are especially helpful, they make it really easy to follow the reconciliation process and understand the logic behind each condition.
Just one small suggestion regarding the metric description.

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Co-authored-by: Susana Ferreira <ssncferreira@gmail.com>
@evgeniy-scherbinaevgeniy-scherbina merged commit2a15aa8 intomainMay 26, 2025
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@evgeniy-scherbinaevgeniy-scherbina deleted the 17988-metric-for-hard-limited-presets branchMay 26, 2025 15:39
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Expose metric for hard-limited presets

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