prometheus/rules/rules.go

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// Copyright 2013 Prometheus Team
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package rules
import (
"html/template"
"time"
"github.com/prometheus/prometheus/rules/ast"
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"github.com/prometheus/prometheus/storage/metric"
)
// A Rule encapsulates a vector expression which is evaluated at a specified
// interval and acted upon (currently either recorded or used for alerting).
type Rule interface {
// Name returns the name of the rule.
Name() string
// EvalRaw evaluates the rule's vector expression without triggering any
// other actions, like recording or alerting.
EvalRaw(timestamp time.Time, storage *metric.TieredStorage) (ast.Vector, error)
// Eval evaluates the rule, including any associated recording or alerting actions.
Eval(timestamp time.Time, storage *metric.TieredStorage) (ast.Vector, error)
// ToDotGraph returns a Graphviz dot graph of the rule.
ToDotGraph() string
// String returns a human-readable string representation of the rule.
String() string
// HTMLSnippet returns a human-readable string representation of the rule,
// decorated with HTML elements for use the web frontend.
HTMLSnippet() template.HTML
}