feat(opencost): expose AWS RI/SP Athena refresh interval - #376
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Wire a new opencost.exporter.aws.riSpRefreshRateHours value (default 1) to the AWS_RI_SP_REFRESH_RATE_HOURS environment variable on the exporter deployment. This lets operators slow the Reserved Instance and Savings Plan Athena refresh cadence, which defaults to hourly. For multi-cluster deployments that share a single CUR export, raising this (e.g. to 24) substantially reduces Athena scan cost. Default of 1 preserves existing behavior. Requires an OpenCost image that reads AWS_RI_SP_REFRESH_RATE_HOURS (opencost/opencost#3977); older images ignore the variable. Also document the config-driven Athena result-reuse caching field (resultReuseMaxAgeMinutes) in the cloudIntegrationJSON example. That field lives in cloud-integration.json and needs no chart wiring, but the example makes it discoverable (opencost/opencost#3953). Bumps chart version 2.5.28 -> 2.5.29 and regenerates the README values table. Signed-off-by: Sridhar Vemula <thewarrior.316@gmail.com>
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Description
Complements two OpenCost changes that reduce AWS Athena scan cost, exposing/documenting them in the chart:
opencost.exporter.aws.riSpRefreshRateHoursvalue (default1) to theAWS_RI_SP_REFRESH_RATE_HOURSenvironment variable on the exporter deployment. Controls how often the Reserved Instance and Savings Plan watchers refresh from Athena (previously hardcoded to 1h).resultReuseMaxAgeMinutesfield in thecloudIntegrationJSONexample. This field lives incloud-integration.json(passed through opaquely by the chart), so it needs no wiring — the example just makes it discoverable.Changes:
values.yaml: addopencost.exporter.aws.riSpRefreshRateHours: 1; addresultReuseMaxAgeMinutesto thecloudIntegrationJSONexampledeployment.yaml:AWS_RI_SP_REFRESH_RATE_HOURSenv sourced from that valueREADME.md: regenerated values tableChart.yaml: version 2.5.28 → 2.5.29Dependency
The
AWS_RI_SP_REFRESH_RATE_HOURSenv var only takes effect once an OpenCost image containing opencost/opencost#3977 ships; older images ignore it (safe to merge). TheresultReuseMaxAgeMinutesfield requires opencost/opencost#3953.User Impact
Backward compatible.
riSpRefreshRateHoursdefaults to1, reproducing today's hourly behavior. Multi-cluster deployments sharing a single CUR export can raise it (e.g.24) and/or setresultReuseMaxAgeMinutesto cut Athena scan cost.Testing
helm lint charts/opencosthelm template charts/opencost | grep -A1 AWS_RI_SP_REFRESH_RATE_HOURS→ rendersvalue: "1"--set opencost.exporter.aws.riSpRefreshRateHours=24→ rendersvalue: "24"