mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-24 07:10:20 +00:00
64 lines
2.4 KiB
Go
64 lines
2.4 KiB
Go
/*
|
|
Copyright 2019 The Kubernetes Authors.
|
|
|
|
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 metrics
|
|
|
|
import (
|
|
"net/http"
|
|
|
|
"github.com/prometheus/client_golang/prometheus/promhttp"
|
|
)
|
|
|
|
// These constants cause handlers serving metrics to behave as described if
|
|
// errors are encountered.
|
|
const (
|
|
// Serve an HTTP status code 500 upon the first error
|
|
// encountered. Report the error message in the body.
|
|
HTTPErrorOnError promhttp.HandlerErrorHandling = iota
|
|
|
|
// Ignore errors and try to serve as many metrics as possible. However,
|
|
// if no metrics can be served, serve an HTTP status code 500 and the
|
|
// last error message in the body. Only use this in deliberate "best
|
|
// effort" metrics collection scenarios. In this case, it is highly
|
|
// recommended to provide other means of detecting errors: By setting an
|
|
// ErrorLog in HandlerOpts, the errors are logged. By providing a
|
|
// Registry in HandlerOpts, the exposed metrics include an error counter
|
|
// "promhttp_metric_handler_errors_total", which can be used for
|
|
// alerts.
|
|
ContinueOnError
|
|
|
|
// Panic upon the first error encountered (useful for "crash only" apps).
|
|
PanicOnError
|
|
)
|
|
|
|
// HandlerOpts specifies options how to serve metrics via an http.Handler. The
|
|
// zero value of HandlerOpts is a reasonable default.
|
|
type HandlerOpts promhttp.HandlerOpts
|
|
|
|
func (ho *HandlerOpts) toPromhttpHandlerOpts() promhttp.HandlerOpts {
|
|
return promhttp.HandlerOpts(*ho)
|
|
}
|
|
|
|
// HandlerFor returns an uninstrumented http.Handler for the provided
|
|
// Gatherer. The behavior of the Handler is defined by the provided
|
|
// HandlerOpts. Thus, HandlerFor is useful to create http.Handlers for custom
|
|
// Gatherers, with non-default HandlerOpts, and/or with custom (or no)
|
|
// instrumentation. Use the InstrumentMetricHandler function to apply the same
|
|
// kind of instrumentation as it is used by the Handler function.
|
|
func HandlerFor(reg Gatherer, opts HandlerOpts) http.Handler {
|
|
return promhttp.HandlerFor(reg, opts.toPromhttpHandlerOpts())
|
|
}
|