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Filter Parameters (v2)

This document outlines the filtering language added to the Allocation API in v1.96 of Kubecost, superseding Kubecost's original filtering parameters (e.g. filterNamespaces=), now referred to as v1 filters. v2 filters introduce support for "not equals" (e.g. namespace != kubecost) queries while maintaining extensibility.
v1 filters will continue to be supported in all relevant APIs. APIs will first check for the filter= parameter. If it is present, v2 filters will be used. If it is not present, APIs will attempt to use v1 filters.

Using filters

v2 filters can be used via the filter= parameter in supported APIs. Supported APIs are currently:

Filtering fields

The available fields for filtering depend on the API being queried.

Allocation APIs, Request Sizing v2 API

The supported filter fields as of v1.96 are:
  • cluster
  • node
  • namespace
  • controllerName
  • controllerKind (e.g. deployment, daemonset)
  • container
  • pod
  • services
  • label
  • annotation (same syntax as label, see examples)
Added in v1.105 of Kubecost:
  • department
  • environment
  • owner
  • product
  • team

Assets API

V2 filter support was added to the /model/assets API in v1.105 of Kubecost.
In v1.105 of Kubecost:
  • name
  • assetType (e.g. node, disk, network, etc.)
  • category (e.g. Compute, Management)
  • cluster
  • project
  • provider
  • providerID
  • account
  • service
  • label

Filter operators

The supported filter operators in v1.96 of Kubecost are:
  • : Equality
    • For string fields (e.g. namespace): equality
    • For slice/array fields (e.g. services): slice contains at least one value equal (equivalent to ~:)
    • For map fields (e.g. labels): map contains key (equivalent to ~:)
  • !: Inequality, or "not contains" if an array type
Added in v1.105 of Kubecost:
  • ~: Contains
    • For string fields: contains
    • For slice fields: slice contains at least one value equal (equivalent to :)
    • For map fields: map contains key (equivalent to :)
  • !~: NotContains, inverse of ~:
  • <~: ContainsPrefix
    • For string fields: string starts with
    • For slice fields: slice contains at least one value that starts with
    • For map fields: map contains at least one key that starts with
  • !<~: NotContainsPrefix, inverse of <~:
  • ~>: ContainsSuffix
    • For string fields: strings ends with
    • For slice fields: slice contains at least one value that ends with
    • For map fields: map contains at least one key that ends with
  • !~>: NotContainsSuffix, inverse of ~>:
Filter values are strings surrounded by ". Multiple values can be separated by commas ,.
Individual filters can be joined by + (representing logical AND) or | (representing logical OR). To use + and | in the same filter expression, scope must be denoted via ( and ). See examples.

Examples

Here are some example filters to see how the filtering language works:
  • namespace:"kubecost"+container:"cost-model" Return only results that are in the kubecost namespace and are for the cost-model container.
  • cluster:"cluster-one"+label[app]:"cost-analyzer" Return only results in cluster cluster-one that are labeled with app=cost-analyzer.
  • cluster!:"cluster-one" Ignore results from cluster cluster-one
  • namespace:"kubecost","kube-system" Return only results from namespaces kubecost and kube-system.
  • namespace!:"kubecost","kube-system" Return results for all namespaces except kubecost and kube-system.
For example, in an Allocation query:
http://localhost:9090/model/allocation?window=1d&accumulate=true&aggregate=namespace&filter=cluster!:%22cluster-one%22
The format is essentially: <filter field> <filter op> <filter value>
curl -G 'localhost:9090/model/assets' \
-d 'window=3d' \
--data-urlencode 'filter=assetType:"disk"'

Formal grammar and implementation

To see the filter language's formal grammar and lexer/parser implementation, check out OpenCost's pkg/filter21/ast.