{"record":{"id":"aae5f543e2b17beb","repo":"thanos-io/thanos","slug":"error-validating-the-config","errorCode":null,"errorMessage":"error validating the config","messagePattern":"error validating the config","errorType":"console","errorClass":null,"httpStatus":null,"severity":"error","filePath":"cmd/thanos/query_frontend.go","lineNumber":303,"sourceCode":"\t}\n\n\tlabelsCacheConfContentYaml, err := cfg.LabelsConfig.CachePathOrContent.Content()\n\tif err != nil {\n\t\treturn err\n\t}\n\tif len(labelsCacheConfContentYaml) > 0 {\n\t\tcacheConfig, err := queryfrontend.NewCacheConfig(logger, labelsCacheConfContentYaml)\n\t\tif err != nil {\n\t\t\treturn errors.Wrap(err, \"initializing the labels cache config\")\n\t\t}\n\t\tcfg.LabelsConfig.ResultsCacheConfig = &queryrange.ResultsCacheConfig{\n\t\t\tCompression: cfg.CacheCompression,\n\t\t\tCacheConfig: *cacheConfig,\n\t\t}\n\t}\n\n\tif err := cfg.Validate(); err != nil {\n\t\treturn errors.Wrap(err, \"error validating the config\")\n\t}\n\n\tif cfg.EnableXFunctions {\n\t\tmaps.Copy(parser.Functions, parse.XFunctions)\n\t}\n\n\tif len(cfg.EnableFeatures) > 0 {\n\t\tfor _, feature := range cfg.EnableFeatures {\n\t\t\tif feature == promqlExperimentalFunctions {\n\t\t\t\tparser.EnableExperimentalFunctions = true\n\t\t\t\tlevel.Info(logger).Log(\"msg\", \"Experimental PromQL functions enabled.\", \"option\", promqlExperimentalFunctions)\n\t\t\t}\n\t\t}\n\t}\n\n\ttripperWare, err := queryfrontend.NewTripperware(cfg.Config, reg, logger)\n\tif err != nil {\n\t\treturn errors.Wrap(err, \"setup tripperwares\")","sourceCodeStart":285,"sourceCodeEnd":321,"githubUrl":"https://github.com/thanos-io/thanos/blob/35b8b991177def87ed52dcf10f9b6d87f07282c8/cmd/thanos/query_frontend.go#L285-L321","documentation":"After parsing both caches, runQueryFrontend calls cfg.Validate() and wraps any failure with this message. Validate enforces cross-field rules of the query-frontend config (e.g. required options, impossible combinations). It signals the flags/inputs are individually parseable but collectively invalid.","triggerScenarios":"Combinations of query-frontend flags that fail Config.Validate, such as enabled features requiring a cache config that is missing, or invalid scheme/URL settings for the downstream.","commonSituations":"Upgrading Thanos and a previously accepted combination is now rejected; enabling cache compression without a cache; typos in required numeric/enum flags.","solutions":["Read the wrapped underlying error from Validate for the specific violated rule.","Align flags with the documented query-frontend config constraints for your Thanos version.","Check release notes/changelog for newly added validation after an upgrade.","Simplify to known-good defaults and re-add flags incrementally."],"exampleFix":"// before\nquery-frontend --enable-features=xfunctions --query-range-response-cache-config-file=\n// after\nquery-frontend --enable-features=xfunctions --query-range-response-cache-config-file=/etc/thanos/cache.yml","handlingStrategy":"validation","validationCode":"for _, f := range enabledFeatures {\n  if f == \"xfunctions\" && resultsCacheFile == \"\" {\n    return errors.New(\"xfunctions requires a results cache config\")\n  }\n}","typeGuard":null,"tryCatchPattern":"if err := cfg.Validate(); err != nil {\n  log.Fatalf(\"query-frontend config rejected: %v\", err)\n}","preventionTips":["Read changelog for new validation rules on upgrade","Re-validate full flag sets in CI","Start from defaults and add flags incrementally"],"tags":["config","validation","cli"],"backgroundTag":"schema-validation-failed","analyzedSha":"35b8b991177def87ed52dcf10f9b6d87f07282c8","analyzedAt":"2026-09-07T01:49:59.689Z","contentChangedAt":"2026-09-07T01:49:59.689Z","schemaVersion":2},"datasetVersion":"2026-09-15T23:17:13.987Z"}