From eb746a4dab4e688dce163b476457bace6494c689 Mon Sep 17 00:00:00 2001 From: Roman Khavronenko Date: Thu, 27 Apr 2023 13:02:47 +0200 Subject: [PATCH] Revert "http server: limit max concurrent requests (#4185)" (#4215) This reverts commit 77f76371 Signed-off-by: hagen1778 --- README.md | 4 ---- app/vmagent/README.md | 2 -- app/vmalert/README.md | 2 -- app/vmauth/README.md | 2 -- app/vmbackup/README.md | 2 -- app/vmbackupmanager/README.md | 2 -- app/vmgateway/README.md | 2 -- app/vmrestore/README.md | 2 -- docs/CHANGELOG.md | 1 - docs/Cluster-VictoriaMetrics.md | 6 ------ docs/README.md | 2 -- docs/Single-server-VictoriaMetrics.md | 2 -- docs/vmagent.md | 2 -- docs/vmalert.md | 2 -- docs/vmauth.md | 2 -- docs/vmbackup.md | 2 -- docs/vmbackupmanager.md | 2 -- docs/vmgateway.md | 2 -- docs/vmrestore.md | 2 -- lib/httpserver/httpserver.go | 26 +++----------------------- 20 files changed, 3 insertions(+), 66 deletions(-) diff --git a/README.md b/README.md index 2775a2f75..a2738ccbc 100644 --- a/README.md +++ b/README.md @@ -2231,10 +2231,6 @@ Pass `-help` to VictoriaMetrics in order to see the list of supported command-li Disable compression of HTTP responses to save CPU resources. By default compression is enabled to save network bandwidth -http.idleConnTimeout duration Timeout for incoming idle http connections (default 1m0s) - -http.maxConcurrentRequests int - The maximum number of concurrent HTTP requests. Use this flag as a safety measure to prevent from overloading during attacks or thundering herd problem.Value should depend on the amount of free memory and number of free file descriptors. The more memory/descriptors is available, the more concurrent requests can be served.If set to zero - no limits are applied. - -http.maxConcurrentRequests int - The maximum number of concurrent HTTP requests. Use this flag as a safety measure to prevent from overloading during attacks or thundering herd problem.Value should depend on the amount of free memory and number of free file descriptors. The more memory/descriptors is available, the more concurrent requests can be served.If set to zero - no limits are applied. -http.maxGracefulShutdownDuration duration The maximum duration for a graceful shutdown of the HTTP server. A highly loaded server may require increased value for a graceful shutdown (default 7s) -http.pathPrefix string diff --git a/app/vmagent/README.md b/app/vmagent/README.md index 8e321950b..3c534a2ad 100644 --- a/app/vmagent/README.md +++ b/app/vmagent/README.md @@ -1211,8 +1211,6 @@ See the docs at https://docs.victoriametrics.com/vmagent.html . Disable compression of HTTP responses to save CPU resources. By default compression is enabled to save network bandwidth -http.idleConnTimeout duration Timeout for incoming idle http connections (default 1m0s) - -http.maxConcurrentRequests int - The maximum number of concurrent HTTP requests. Use this flag as a safety measure to prevent from overloading during attacks or thundering herd problem.Value should depend on the amount of free memory and number of free file descriptors. The more memory/descriptors is available, the more concurrent requests can be served.If set to zero - no limits are applied. -http.maxGracefulShutdownDuration duration The maximum duration for a graceful shutdown of the HTTP server. A highly loaded server may require increased value for a graceful shutdown (default 7s) -http.pathPrefix string diff --git a/app/vmalert/README.md b/app/vmalert/README.md index 749a161d2..974c3ef90 100644 --- a/app/vmalert/README.md +++ b/app/vmalert/README.md @@ -941,8 +941,6 @@ The shortlist of configuration flags is the following: Disable compression of HTTP responses to save CPU resources. By default compression is enabled to save network bandwidth -http.idleConnTimeout duration Timeout for incoming idle http connections (default 1m0s) - -http.maxConcurrentRequests int - The maximum number of concurrent HTTP requests. Use this flag as a safety measure to prevent from overloading during attacks or thundering herd problem.Value should depend on the amount of free memory and number of free file descriptors. The more memory/descriptors is available, the more concurrent requests can be served.If set to zero - no limits are applied. -http.maxGracefulShutdownDuration duration The maximum duration for a graceful shutdown of the HTTP server. A highly loaded server may require increased value for a graceful shutdown (default 7s) -http.pathPrefix string diff --git a/app/vmauth/README.md b/app/vmauth/README.md index 4fed2ab8d..fe399f9eb 100644 --- a/app/vmauth/README.md +++ b/app/vmauth/README.md @@ -331,8 +331,6 @@ See the docs at https://docs.victoriametrics.com/vmauth.html . Disable compression of HTTP responses to save CPU resources. By default compression is enabled to save network bandwidth -http.idleConnTimeout duration Timeout for incoming idle http connections (default 1m0s) - -http.maxConcurrentRequests int - The maximum number of concurrent HTTP requests. Use this flag as a safety measure to prevent from overloading during attacks or thundering herd problem.Value should depend on the amount of free memory and number of free file descriptors. The more memory/descriptors is available, the more concurrent requests can be served.If set to zero - no limits are applied. -http.maxGracefulShutdownDuration duration The maximum duration for a graceful shutdown of the HTTP server. A highly loaded server may require increased value for a graceful shutdown (default 7s) -http.pathPrefix string diff --git a/app/vmbackup/README.md b/app/vmbackup/README.md index 2e72a399f..bd73b0410 100644 --- a/app/vmbackup/README.md +++ b/app/vmbackup/README.md @@ -207,8 +207,6 @@ See [this article](https://medium.com/@valyala/speeding-up-backups-for-big-time- Disable compression of HTTP responses to save CPU resources. By default compression is enabled to save network bandwidth -http.idleConnTimeout duration Timeout for incoming idle http connections (default 1m0s) - -http.maxConcurrentRequests int - The maximum number of concurrent HTTP requests. Use this flag as a safety measure to prevent from overloading during attacks or thundering herd problem.Value should depend on the amount of free memory and number of free file descriptors. The more memory/descriptors is available, the more concurrent requests can be served.If set to zero - no limits are applied. -http.maxGracefulShutdownDuration duration The maximum duration for a graceful shutdown of the HTTP server. A highly loaded server may require increased value for a graceful shutdown (default 7s) -http.pathPrefix string diff --git a/app/vmbackupmanager/README.md b/app/vmbackupmanager/README.md index 619fa5ff1..56af3501e 100644 --- a/app/vmbackupmanager/README.md +++ b/app/vmbackupmanager/README.md @@ -394,8 +394,6 @@ command-line flags: Disable compression of HTTP responses to save CPU resources. By default compression is enabled to save network bandwidth -http.idleConnTimeout duration Timeout for incoming idle http connections (default 1m0s) - -http.maxConcurrentRequests int - The maximum number of concurrent HTTP requests. Use this flag as a safety measure to prevent from overloading during attacks or thundering herd problem.Value should depend on the amount of free memory and number of free file descriptors. The more memory/descriptors is available, the more concurrent requests can be served.If set to zero - no limits are applied. -http.maxGracefulShutdownDuration duration The maximum duration for a graceful shutdown of the HTTP server. A highly loaded server may require increased value for a graceful shutdown (default 7s) -http.pathPrefix string diff --git a/app/vmgateway/README.md b/app/vmgateway/README.md index e6dbb2529..2eeae6f75 100644 --- a/app/vmgateway/README.md +++ b/app/vmgateway/README.md @@ -349,8 +349,6 @@ The shortlist of configuration flags include the following: Disable compression of HTTP responses to save CPU resources. By default compression is enabled to save network bandwidth -http.idleConnTimeout duration Timeout for incoming idle http connections (default 1m0s) - -http.maxConcurrentRequests int - The maximum number of concurrent HTTP requests. Use this flag as a safety measure to prevent from overloading during attacks or thundering herd problem.Value should depend on the amount of free memory and number of free file descriptors. The more memory/descriptors is available, the more concurrent requests can be served.If set to zero - no limits are applied. -http.maxGracefulShutdownDuration duration The maximum duration for a graceful shutdown of the HTTP server. A highly loaded server may require increased value for a graceful shutdown (default 7s) -http.pathPrefix string diff --git a/app/vmrestore/README.md b/app/vmrestore/README.md index 109656dc9..28295537f 100644 --- a/app/vmrestore/README.md +++ b/app/vmrestore/README.md @@ -111,8 +111,6 @@ i.e. the end result would be similar to [rsync --delete](https://askubuntu.com/q Disable compression of HTTP responses to save CPU resources. By default compression is enabled to save network bandwidth -http.idleConnTimeout duration Timeout for incoming idle http connections (default 1m0s) - -http.maxConcurrentRequests int - The maximum number of concurrent HTTP requests. Use this flag as a safety measure to prevent from overloading during attacks or thundering herd problem.Value should depend on the amount of free memory and number of free file descriptors. The more memory/descriptors is available, the more concurrent requests can be served.If set to zero - no limits are applied. -http.maxGracefulShutdownDuration duration The maximum duration for a graceful shutdown of the HTTP server. A highly loaded server may require increased value for a graceful shutdown (default 7s) -http.pathPrefix string diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md index fdc96b107..8e1a3d58e 100644 --- a/docs/CHANGELOG.md +++ b/docs/CHANGELOG.md @@ -23,7 +23,6 @@ The following tip changes can be tested by building VictoriaMetrics components f * FEATURE: [vmbackupmanager](https://docs.victoriametrics.com/vmbackupmanager.html): add `created_at` field to the output of `/api/v1/backups` API and `vmbackupmanager backup list` command. See this [doc](https://docs.victoriametrics.com/vmbackupmanager.html#api-methods) for data format details. * FEATURE: deprecate `-bigMergeConcurrency` command-line flag, since improper configuration for this flag frequently led to uncontrolled growth of unmerged parts, which, in turn, could lead to queries slowdown and increased CPU usage. The concurrency for [background merges](https://docs.victoriametrics.com/#storage) can be controlled via `-smallMergeConcurrency` command-line flag, though it isn't recommended to do in general case. * FEATURE: [vmagent](https://docs.victoriametrics.com/vmagent.html): support new filtering options `filter` and `node_filter` for [consul service discovery](https://docs.victoriametrics.com/sd_configs.html#consul_sd_configs). See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4183) for details. -* FEATURE: introduce `-http.maxConcurrentRequests` command-line flag to protect VM components from resource exhaustion during unexpected spikes of HTTP requests. By default, the new flag's value is set to 0 which means no limits are applied. * FEATURE: [vmctl](https://docs.victoriametrics.com/vmctl.html): add support for the different time formats for `--vm-native-filter-time-start` and `--vm-native-filter-time-end` flags if the native binary protocol is used for migration. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4091). * FEATURE: [vmui](https://docs.victoriametrics.com/#vmui): integrate WITH template playground. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3811). * FEATURE: [vmui](https://docs.victoriametrics.com/#vmui): add a comparison of data from the previous day with data from the current day to the `Cardinality Explorer`. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3967). diff --git a/docs/Cluster-VictoriaMetrics.md b/docs/Cluster-VictoriaMetrics.md index 1712c55d9..bf722d8fd 100644 --- a/docs/Cluster-VictoriaMetrics.md +++ b/docs/Cluster-VictoriaMetrics.md @@ -855,8 +855,6 @@ Below is the output for `/path/to/vminsert -help`: Disable compression of HTTP responses to save CPU resources. By default compression is enabled to save network bandwidth -http.idleConnTimeout duration Timeout for incoming idle http connections (default 1m0s) - -http.maxConcurrentRequests int - The maximum number of concurrent HTTP requests. Use this flag as a safety measure to prevent from overloading during attacks or thundering herd problem.Value should depend on the amount of free memory and number of free file descriptors. The more memory/descriptors is available, the more concurrent requests can be served.If set to zero - no limits are applied. -http.maxGracefulShutdownDuration duration The maximum duration for a graceful shutdown of the HTTP server. A highly loaded server may require increased value for a graceful shutdown (default 7s) -http.pathPrefix string @@ -1066,8 +1064,6 @@ Below is the output for `/path/to/vmselect -help`: Disable compression of HTTP responses to save CPU resources. By default compression is enabled to save network bandwidth -http.idleConnTimeout duration Timeout for incoming idle http connections (default 1m0s) - -http.maxConcurrentRequests int - The maximum number of concurrent HTTP requests. Use this flag as a safety measure to prevent from overloading during attacks or thundering herd problem.Value should depend on the amount of free memory and number of free file descriptors. The more memory/descriptors is available, the more concurrent requests can be served.If set to zero - no limits are applied. -http.maxGracefulShutdownDuration duration The maximum duration for a graceful shutdown of the HTTP server. A highly loaded server may require increased value for a graceful shutdown (default 7s) -http.pathPrefix string @@ -1288,8 +1284,6 @@ Below is the output for `/path/to/vmstorage -help`: Disable compression of HTTP responses to save CPU resources. By default compression is enabled to save network bandwidth -http.idleConnTimeout duration Timeout for incoming idle http connections (default 1m0s) - -http.maxConcurrentRequests int - The maximum number of concurrent HTTP requests. Use this flag as a safety measure to prevent from overloading during attacks or thundering herd problem.Value should depend on the amount of free memory and number of free file descriptors. The more memory/descriptors is available, the more concurrent requests can be served.If set to zero - no limits are applied. -http.maxGracefulShutdownDuration duration The maximum duration for a graceful shutdown of the HTTP server. A highly loaded server may require increased value for a graceful shutdown (default 7s) -http.pathPrefix string diff --git a/docs/README.md b/docs/README.md index cb152c7cb..e83b65020 100644 --- a/docs/README.md +++ b/docs/README.md @@ -2232,8 +2232,6 @@ Pass `-help` to VictoriaMetrics in order to see the list of supported command-li Disable compression of HTTP responses to save CPU resources. By default compression is enabled to save network bandwidth -http.idleConnTimeout duration Timeout for incoming idle http connections (default 1m0s) - -http.maxConcurrentRequests int - The maximum number of concurrent HTTP requests. Use this flag as a safety measure to prevent from overloading during attacks or thundering herd problem.Value should depend on the amount of free memory and number of free file descriptors. The more memory/descriptors is available, the more concurrent requests can be served.If set to zero - no limits are applied. -http.maxGracefulShutdownDuration duration The maximum duration for a graceful shutdown of the HTTP server. A highly loaded server may require increased value for a graceful shutdown (default 7s) -http.pathPrefix string diff --git a/docs/Single-server-VictoriaMetrics.md b/docs/Single-server-VictoriaMetrics.md index ac1f7d162..6c062c948 100644 --- a/docs/Single-server-VictoriaMetrics.md +++ b/docs/Single-server-VictoriaMetrics.md @@ -2235,8 +2235,6 @@ Pass `-help` to VictoriaMetrics in order to see the list of supported command-li Disable compression of HTTP responses to save CPU resources. By default compression is enabled to save network bandwidth -http.idleConnTimeout duration Timeout for incoming idle http connections (default 1m0s) - -http.maxConcurrentRequests int - The maximum number of concurrent HTTP requests. Use this flag as a safety measure to prevent from overloading during attacks or thundering herd problem.Value should depend on the amount of free memory and number of free file descriptors. The more memory/descriptors is available, the more concurrent requests can be served.If set to zero - no limits are applied. -http.maxGracefulShutdownDuration duration The maximum duration for a graceful shutdown of the HTTP server. A highly loaded server may require increased value for a graceful shutdown (default 7s) -http.pathPrefix string diff --git a/docs/vmagent.md b/docs/vmagent.md index a33222d34..69e380684 100644 --- a/docs/vmagent.md +++ b/docs/vmagent.md @@ -1215,8 +1215,6 @@ See the docs at https://docs.victoriametrics.com/vmagent.html . Disable compression of HTTP responses to save CPU resources. By default compression is enabled to save network bandwidth -http.idleConnTimeout duration Timeout for incoming idle http connections (default 1m0s) - -http.maxConcurrentRequests int - The maximum number of concurrent HTTP requests. Use this flag as a safety measure to prevent from overloading during attacks or thundering herd problem.Value should depend on the amount of free memory and number of free file descriptors. The more memory/descriptors is available, the more concurrent requests can be served.If set to zero - no limits are applied. -http.maxGracefulShutdownDuration duration The maximum duration for a graceful shutdown of the HTTP server. A highly loaded server may require increased value for a graceful shutdown (default 7s) -http.pathPrefix string diff --git a/docs/vmalert.md b/docs/vmalert.md index e354cfbfd..751e6dd0e 100644 --- a/docs/vmalert.md +++ b/docs/vmalert.md @@ -945,8 +945,6 @@ The shortlist of configuration flags is the following: Disable compression of HTTP responses to save CPU resources. By default compression is enabled to save network bandwidth -http.idleConnTimeout duration Timeout for incoming idle http connections (default 1m0s) - -http.maxConcurrentRequests int - The maximum number of concurrent HTTP requests. Use this flag as a safety measure to prevent from overloading during attacks or thundering herd problem.Value should depend on the amount of free memory and number of free file descriptors. The more memory/descriptors is available, the more concurrent requests can be served.If set to zero - no limits are applied. -http.maxGracefulShutdownDuration duration The maximum duration for a graceful shutdown of the HTTP server. A highly loaded server may require increased value for a graceful shutdown (default 7s) -http.pathPrefix string diff --git a/docs/vmauth.md b/docs/vmauth.md index cb3ccc2eb..b3c2dc0f7 100644 --- a/docs/vmauth.md +++ b/docs/vmauth.md @@ -335,8 +335,6 @@ See the docs at https://docs.victoriametrics.com/vmauth.html . Disable compression of HTTP responses to save CPU resources. By default compression is enabled to save network bandwidth -http.idleConnTimeout duration Timeout for incoming idle http connections (default 1m0s) - -http.maxConcurrentRequests int - The maximum number of concurrent HTTP requests. Use this flag as a safety measure to prevent from overloading during attacks or thundering herd problem.Value should depend on the amount of free memory and number of free file descriptors. The more memory/descriptors is available, the more concurrent requests can be served.If set to zero - no limits are applied. -http.maxGracefulShutdownDuration duration The maximum duration for a graceful shutdown of the HTTP server. A highly loaded server may require increased value for a graceful shutdown (default 7s) -http.pathPrefix string diff --git a/docs/vmbackup.md b/docs/vmbackup.md index de1091eea..ab3438045 100644 --- a/docs/vmbackup.md +++ b/docs/vmbackup.md @@ -211,8 +211,6 @@ See [this article](https://medium.com/@valyala/speeding-up-backups-for-big-time- Disable compression of HTTP responses to save CPU resources. By default compression is enabled to save network bandwidth -http.idleConnTimeout duration Timeout for incoming idle http connections (default 1m0s) - -http.maxConcurrentRequests int - The maximum number of concurrent HTTP requests. Use this flag as a safety measure to prevent from overloading during attacks or thundering herd problem.Value should depend on the amount of free memory and number of free file descriptors. The more memory/descriptors is available, the more concurrent requests can be served.If set to zero - no limits are applied. -http.maxGracefulShutdownDuration duration The maximum duration for a graceful shutdown of the HTTP server. A highly loaded server may require increased value for a graceful shutdown (default 7s) -http.pathPrefix string diff --git a/docs/vmbackupmanager.md b/docs/vmbackupmanager.md index 2dd8594e2..4a31b9f64 100644 --- a/docs/vmbackupmanager.md +++ b/docs/vmbackupmanager.md @@ -398,8 +398,6 @@ command-line flags: Disable compression of HTTP responses to save CPU resources. By default compression is enabled to save network bandwidth -http.idleConnTimeout duration Timeout for incoming idle http connections (default 1m0s) - -http.maxConcurrentRequests int - The maximum number of concurrent HTTP requests. Use this flag as a safety measure to prevent from overloading during attacks or thundering herd problem.Value should depend on the amount of free memory and number of free file descriptors. The more memory/descriptors is available, the more concurrent requests can be served.If set to zero - no limits are applied. -http.maxGracefulShutdownDuration duration The maximum duration for a graceful shutdown of the HTTP server. A highly loaded server may require increased value for a graceful shutdown (default 7s) -http.pathPrefix string diff --git a/docs/vmgateway.md b/docs/vmgateway.md index 02c1f44af..8d11694ff 100644 --- a/docs/vmgateway.md +++ b/docs/vmgateway.md @@ -353,8 +353,6 @@ The shortlist of configuration flags include the following: Disable compression of HTTP responses to save CPU resources. By default compression is enabled to save network bandwidth -http.idleConnTimeout duration Timeout for incoming idle http connections (default 1m0s) - -http.maxConcurrentRequests int - The maximum number of concurrent HTTP requests. Use this flag as a safety measure to prevent from overloading during attacks or thundering herd problem.Value should depend on the amount of free memory and number of free file descriptors. The more memory/descriptors is available, the more concurrent requests can be served.If set to zero - no limits are applied. -http.maxGracefulShutdownDuration duration The maximum duration for a graceful shutdown of the HTTP server. A highly loaded server may require increased value for a graceful shutdown (default 7s) -http.pathPrefix string diff --git a/docs/vmrestore.md b/docs/vmrestore.md index fd3e55214..4bbe3278c 100644 --- a/docs/vmrestore.md +++ b/docs/vmrestore.md @@ -115,8 +115,6 @@ i.e. the end result would be similar to [rsync --delete](https://askubuntu.com/q Disable compression of HTTP responses to save CPU resources. By default compression is enabled to save network bandwidth -http.idleConnTimeout duration Timeout for incoming idle http connections (default 1m0s) - -http.maxConcurrentRequests int - The maximum number of concurrent HTTP requests. Use this flag as a safety measure to prevent from overloading during attacks or thundering herd problem.Value should depend on the amount of free memory and number of free file descriptors. The more memory/descriptors is available, the more concurrent requests can be served.If set to zero - no limits are applied. -http.maxGracefulShutdownDuration duration The maximum duration for a graceful shutdown of the HTTP server. A highly loaded server may require increased value for a graceful shutdown (default 7s) -http.pathPrefix string diff --git a/lib/httpserver/httpserver.go b/lib/httpserver/httpserver.go index becd8e8ae..a8335c3b8 100644 --- a/lib/httpserver/httpserver.go +++ b/lib/httpserver/httpserver.go @@ -51,10 +51,6 @@ var ( shutdownDelay = flag.Duration("http.shutdownDelay", 0, `Optional delay before http server shutdown. During this delay, the server returns non-OK responses from /health page, so load balancers can route new requests to other servers`) idleConnTimeout = flag.Duration("http.idleConnTimeout", time.Minute, "Timeout for incoming idle http connections") connTimeout = flag.Duration("http.connTimeout", 2*time.Minute, `Incoming http connections are closed after the configured timeout. This may help to spread the incoming load among a cluster of services behind a load balancer. Please note that the real timeout may be bigger by up to 10% as a protection against the thundering herd problem`) - maxConcurrentRequests = flag.Int("http.maxConcurrentRequests", 0, "The maximum number of concurrent HTTP requests. "+ - "Use this flag as a safety measure to prevent from overloading during attacks or thundering herd problem."+ - "Value should depend on the amount of free memory and number of free file descriptors. The more memory/descriptors is available, the more concurrent requests can be served."+ - "If set to zero - no limits are applied.") ) var ( @@ -64,7 +60,6 @@ var ( type server struct { shutdownDelayDeadline int64 - concurrencyLimiter chan struct{} s *http.Server } @@ -76,9 +71,9 @@ type server struct { // In such cases the caller must serve the request. type RequestHandler func(w http.ResponseWriter, r *http.Request) bool -// Serve starts a http server on the given addr with the given optional rh. +// Serve starts an http server on the given addr with the given optional rh. // -// By default, all the responses are transparently compressed, since egress traffic is usually expensive. +// By default all the responses are transparently compressed, since egress traffic is usually expensive. // // The compression is also disabled if -http.disableResponseCompression flag is set. // @@ -141,7 +136,6 @@ func serveWithListener(addr string, ln net.Listener, rh RequestHandler) { return context.WithValue(ctx, connDeadlineTimeKey, &deadline) }, } - s.concurrencyLimiter = make(chan struct{}, *maxConcurrentRequests) serversLock.Lock() servers[addr] = &s serversLock.Unlock() @@ -347,19 +341,6 @@ func handlerWrapper(s *server, w http.ResponseWriter, r *http.Request, rh Reques if !CheckBasicAuth(w, r) { return } - - if *maxConcurrentRequests > 0 { - select { - case s.concurrencyLimiter <- struct{}{}: - default: - Errorf(w, r, "couldn't start processing the request at path %q, "+ - "since -http.maxConcurrentRequests=%d concurrent requests are executed.", r.URL.Path, *maxConcurrentRequests) - limitReachedRequestErrors.Inc() - return - } - defer func() { <-s.concurrencyLimiter }() - } - if rh(w, r) { return } @@ -448,8 +429,7 @@ var ( pprofDefaultRequests = metrics.NewCounter(`vm_http_requests_total{path="/debug/pprof/default"}`) faviconRequests = metrics.NewCounter(`vm_http_requests_total{path="/favicon.ico"}`) - unsupportedRequestErrors = metrics.NewCounter(`vm_http_request_errors_total{path="*", reason="unsupported"}`) - limitReachedRequestErrors = metrics.NewCounter(`vm_http_request_errors_total{path="*", reason="concurrency limit"}`) + unsupportedRequestErrors = metrics.NewCounter(`vm_http_request_errors_total{path="*", reason="unsupported"}`) requestsTotal = metrics.NewCounter(`vm_http_requests_all_total`) )