grafana/pkg/services/ngalert/models/constants.go

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package models
const (
// FromAlertHeaderName name of header added to datasource query requests
// to denote request is originating from Grafana Alerting.
//
// Data sources might check this in query method as sometimes alerting
// needs special considerations.
// Several existing systems also compare against the value of this header.
// Altering this constitutes a breaking change.
//
// Note: The spelling of this headers is intentionally degenerate from the
// others for compatibility reasons. When sent over a network, the key of
// this header is canonicalized to "Fromalert".
// However, some datasources still compare against the string "FromAlert".
FromAlertHeaderName = "FromAlert"
// CacheSkipHeaderName name of header added to datasource query requests
// to denote request should not be cached.
CacheSkipHeaderName = "X-Cache-Skip"
)