Initial QSfera import

Server/vendor/go.opentelemetry.io/contrib/zpages/LICENSE

@@ -0,0 +1,231 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
+
+   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.
+
+--------------------------------------------------------------------------------
+
+Copyright 2009 The Go Authors.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google LLC nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Server/vendor/go.opentelemetry.io/contrib/zpages/boundaries.go

@@ -0,0 +1,50 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package zpages // import "go.opentelemetry.io/contrib/zpages"
+
+import (
+	"slices"
+	"time"
+)
+
+const (
+	zeroDuration = time.Duration(0)
+	maxDuration  = time.Duration(1<<63 - 1)
+)
+
+var defaultBoundaries = newBoundaries([]time.Duration{
+	10 * time.Microsecond,
+	100 * time.Microsecond,
+	time.Millisecond,
+	10 * time.Millisecond,
+	100 * time.Millisecond,
+	time.Second,
+	10 * time.Second,
+	100 * time.Second,
+})
+
+// boundaries represents the interval bounds for the latency based samples.
+type boundaries struct {
+	durations []time.Duration
+}
+
+// newBoundaries returns a new boundaries.
+func newBoundaries(durations []time.Duration) *boundaries {
+	slices.Sort(durations)
+	return &boundaries{durations: durations}
+}
+
+// numBuckets returns the number of buckets needed for these boundaries.
+func (lb boundaries) numBuckets() int {
+	return len(lb.durations) + 1
+}
+
+// getBucketIndex returns the appropriate bucket index for a given latency.
+func (lb boundaries) getBucketIndex(latency time.Duration) int {
+	i := 0
+	for i < len(lb.durations) && latency >= lb.durations[i] {
+		i++
+	}
+	return i
+}

Server/vendor/go.opentelemetry.io/contrib/zpages/bucket.go

@@ -0,0 +1,76 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+// Copyright 2017, OpenCensus 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 zpages // import "go.opentelemetry.io/contrib/zpages"
+
+import (
+	"time"
+
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
+)
+
+const (
+	// defaultBucketCapacity is the default capacity for every bucket (latency or error based).
+	defaultBucketCapacity = 10
+	// samplePeriod is the minimum time between accepting spans in a single bucket.
+	samplePeriod = time.Second
+)
+
+// bucket is a container for a set of spans for latency buckets or errored spans.
+type bucket struct {
+	nextTime  time.Time               // next time we can accept a span
+	buffer    []sdktrace.ReadOnlySpan // circular buffer of spans
+	nextIndex int                     // location next ReadOnlySpan should be placed in buffer
+	overflow  bool                    // whether the circular buffer has wrapped around
+}
+
+// newBucket returns a new bucket with the given capacity.
+func newBucket(capacity uint) *bucket {
+	return &bucket{
+		buffer: make([]sdktrace.ReadOnlySpan, capacity),
+	}
+}
+
+// add adds a span to the bucket, if nextTime has been reached.
+func (b *bucket) add(s sdktrace.ReadOnlySpan) {
+	if s.EndTime().Before(b.nextTime) {
+		return
+	}
+	if len(b.buffer) == 0 {
+		return
+	}
+	b.nextTime = s.EndTime().Add(samplePeriod)
+	b.buffer[b.nextIndex] = s
+	b.nextIndex++
+	if b.nextIndex == len(b.buffer) {
+		b.nextIndex = 0
+		b.overflow = true
+	}
+}
+
+// len returns the number of spans in the bucket.
+func (b *bucket) len() int {
+	if b.overflow {
+		return len(b.buffer)
+	}
+	return b.nextIndex
+}
+
+// spans returns the spans in this bucket.
+func (b *bucket) spans() []sdktrace.ReadOnlySpan {
+	return append([]sdktrace.ReadOnlySpan(nil), b.buffer[0:b.len()]...)
+}

Server/vendor/go.opentelemetry.io/contrib/zpages/doc.go

@@ -0,0 +1,6 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+// Package zpages implements a collection of HTML pages that display
+// telemetry stats.
+package zpages // import "go.opentelemetry.io/contrib/zpages"

Server/vendor/go.opentelemetry.io/contrib/zpages/internal/gen.go

@@ -0,0 +1,13 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+// Package internal provides non-public types for the zpages package.
+package internal // import "go.opentelemetry.io/contrib/zpages/internal"
+
+import "embed"
+
+// Templates embeds all the HTML templates used used to serve the tracez
+// endpoint
+//
+//go:embed templates/*
+var Templates embed.FS

Server/vendor/go.opentelemetry.io/contrib/zpages/internal/templates/footer.html

@@ -0,0 +1,2 @@
+</body>
+</html>

Server/vendor/go.opentelemetry.io/contrib/zpages/internal/templates/header.html

@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<html lang="en"><head>
+    <meta charset="utf-8">
+    <title>{{.Title}}</title>
+    <link rel="shortcut icon" href="https://opentelemetry.io/favicons/favicon.ico"/>
+    <link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
+    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/material-design-lite/1.3.0/material.indigo-pink.min.css">
+    <script defer src="https://cdnjs.cloudflare.com/ajax/libs/material-design-lite/1.3.0/material.min.js"></script>
+</head>
+<body>
+<h1>{{.Title}}</h1>

Server/vendor/go.opentelemetry.io/contrib/zpages/internal/templates/summary.html

@@ -0,0 +1,43 @@
+<table style="border-spacing: 0">
+    <tr>
+        <td colspan=1 align=left><b>Span Name</b></td>
+        <td>&nbsp;&nbsp;|&nbsp;&nbsp;</td><td colspan=1 align="center"><b>Running</b></td>
+        <td>&nbsp;&nbsp;|&nbsp;&nbsp;</td>
+        <td colspan=9 align="center"><b>Latency Samples</b></td>
+        <td>&nbsp;&nbsp;|&nbsp;&nbsp;</td>
+        <td colspan=1 align="center"><b>Error Samples</b></td>
+    </tr>
+    <tr>
+        <td colspan=1></td>
+        <td>&nbsp;&nbsp;|&nbsp;&nbsp;</td>
+        <td colspan=1></td>
+        <td>&nbsp;&nbsp;|&nbsp;&nbsp;</td>
+    {{range .LatencyBucketNames}}<th colspan=1 align="center"><b>[{{.}}]</b></th>{{end}}
+        <td>&nbsp;&nbsp;|&nbsp;&nbsp;</td>
+        <td colspan=1></td>
+    </tr>
+{{$a := .TracesEndpoint}}
+{{$links := .Links}}
+{{range $rowindex, $row := .Rows}}
+{{- $name := .Name}}
+{{- if even $rowindex}}<tr style="background: #eee">{{else}}<tr>{{end -}}
+    <td>{{.Name}}</td><td>&nbsp;&nbsp;|&nbsp;&nbsp;</td>
+{{- if $links -}}
+    <td align="center"><a href="{{$a}}?zspanname={{$name}}&ztype=0">{{.Active}}</a></td>
+{{- else -}}
+    <td>{{.Active}}</td>
+{{- end -}}
+    <td>&nbsp;&nbsp;|&nbsp;&nbsp;</td>
+{{- if $links -}}
+{{range $index, $value := .Latency}}<td align="center"><a href="{{$a}}?zspanname={{$name}}&ztype=1&zlatencybucket={{$index}}">{{$value}}</a></td>{{end}}
+{{- else -}}
+{{range .Latency}}<td>{{.}}</td>{{end}}
+{{- end -}}
+    <td>&nbsp;&nbsp;|&nbsp;&nbsp;</td>
+{{- if $links -}}
+    <td align="center"><a href="{{$a}}?zspanname={{$name}}&ztype=2&zlatencybucket=0">{{.Errors}}</td>
+{{- else -}}
+    <td>{{.Errors}}</td>
+{{- end -}}
+</tr>
+{{end}}</table>

Server/vendor/go.opentelemetry.io/contrib/zpages/internal/templates/traces.html

@@ -0,0 +1,10 @@
+<p><b>Span Name: {{.Name}} </b></p>
+<p>{{.Num}} Requests</p>
+<pre>
+When                       Elapsed (sec)
+----------------------------------------
+{{range .Rows}}{{printf "%26s" (index .Fields 0)}} {{printf "%12s" (index .Fields 1)}} {{index .Fields 2}}{{.|spanRow}}
+{{end}}</pre>
+<br>
+<p><b style="color:blue;">TraceId</b> means sampled request.
+    <b style="color:black;">TraceId</b> means not sampled request.</p>

Server/vendor/go.opentelemetry.io/contrib/zpages/spanprocessor.go

@@ -0,0 +1,223 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+// Copyright 2017, OpenCensus 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 zpages // import "go.opentelemetry.io/contrib/zpages"
+
+import (
+	"context"
+	"sync"
+
+	"go.opentelemetry.io/otel/codes"
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
+	"go.opentelemetry.io/otel/trace"
+)
+
+var _ sdktrace.SpanProcessor = (*SpanProcessor)(nil)
+
+// perMethodSummary is a summary of the spans stored for a single span name.
+type perMethodSummary struct {
+	activeSpans  int
+	latencySpans []int
+	errorSpans   int
+}
+
+// SpanProcessor is an sdktrace.SpanProcessor implementation that exposes zpages functionality for opentelemetry-go.
+//
+// It tracks all active spans, and stores samples of spans based on latency for non errored spans,
+// and samples for errored spans.
+type SpanProcessor struct {
+	// Cannot keep track of the active Spans per name because the Span interface,
+	// allows the name to be changed, and that will leak memory.
+	activeSpansStore sync.Map
+	spanSampleStores sync.Map
+}
+
+// NewSpanProcessor returns a new SpanProcessor.
+func NewSpanProcessor() *SpanProcessor {
+	return &SpanProcessor{}
+}
+
+// OnStart adds span as active and reports it with zpages.
+func (ssm *SpanProcessor) OnStart(_ context.Context, span sdktrace.ReadWriteSpan) {
+	sc := span.SpanContext()
+	if sc.IsValid() {
+		ssm.activeSpansStore.Store(spanKey(sc), span)
+	}
+}
+
+// OnEnd processes all spans and reports them with zpages.
+func (ssm *SpanProcessor) OnEnd(span sdktrace.ReadOnlySpan) {
+	sc := span.SpanContext()
+	if sc.IsValid() {
+		ssm.activeSpansStore.Delete(spanKey(sc))
+	}
+
+	name := span.Name()
+	value, ok := ssm.spanSampleStores.Load(name)
+	if !ok {
+		value, _ = ssm.spanSampleStores.LoadOrStore(name, newSampleStore(defaultBucketCapacity, defaultBucketCapacity))
+	}
+	value.(*sampleStore).sampleSpan(span)
+}
+
+// Shutdown does nothing.
+func (*SpanProcessor) Shutdown(context.Context) error {
+	// Do nothing
+	return nil
+}
+
+// ForceFlush does nothing.
+func (*SpanProcessor) ForceFlush(context.Context) error {
+	// Do nothing
+	return nil
+}
+
+// spanStoreForName returns the sampleStore for the given name.
+//
+// It returns nil if it doesn't exist.
+func (ssm *SpanProcessor) spanStoreForName(name string) *sampleStore {
+	if value, ok := ssm.spanSampleStores.Load(name); ok {
+		return value.(*sampleStore)
+	}
+	return nil
+}
+
+// spansPerMethod returns a summary of what spans are being stored for each span name.
+func (ssm *SpanProcessor) spansPerMethod() map[string]*perMethodSummary {
+	out := make(map[string]*perMethodSummary)
+	ssm.spanSampleStores.Range(func(name, s any) bool {
+		out[name.(string)] = s.(*sampleStore).perMethodSummary()
+		return true
+	})
+	ssm.activeSpansStore.Range(func(_, sp any) bool {
+		span := sp.(sdktrace.ReadOnlySpan)
+		if pms, ok := out[span.Name()]; ok {
+			pms.activeSpans++
+			return true
+		}
+		out[span.Name()] = &perMethodSummary{activeSpans: 1}
+		return true
+	})
+	return out
+}
+
+// activeSpans returns the active spans for the given name.
+func (ssm *SpanProcessor) activeSpans(name string) []sdktrace.ReadOnlySpan {
+	var out []sdktrace.ReadOnlySpan
+	ssm.activeSpansStore.Range(func(_, sp any) bool {
+		span := sp.(sdktrace.ReadOnlySpan)
+		if span.Name() == name {
+			out = append(out, span)
+		}
+		return true
+	})
+	return out
+}
+
+// errorSpans returns a sample of error spans.
+func (ssm *SpanProcessor) errorSpans(name string) []sdktrace.ReadOnlySpan {
+	s := ssm.spanStoreForName(name)
+	if s == nil {
+		return nil
+	}
+	return s.errorSpans()
+}
+
+// spansByLatency returns a sample of successful spans.
+//
+// minLatency is the minimum latency of spans to be returned.
+// maxDuration, if nonzero, is the maximum latency of spans to be returned.
+func (ssm *SpanProcessor) spansByLatency(name string, latencyBucketIndex int) []sdktrace.ReadOnlySpan {
+	s := ssm.spanStoreForName(name)
+	if s == nil {
+		return nil
+	}
+	return s.spansByLatency(latencyBucketIndex)
+}
+
+// sampleStore stores a sampled of spans for a particular span name.
+//
+// It contains sample of spans for error requests (status code is codes.Error);
+// and a sample of spans for successful requests, bucketed by latency.
+type sampleStore struct {
+	sync.Mutex // protects everything below.
+	latency    []*bucket
+	errors     *bucket
+}
+
+// newSampleStore creates a sampleStore.
+func newSampleStore(latencyBucketSize, errorBucketSize uint) *sampleStore {
+	s := &sampleStore{
+		latency: make([]*bucket, defaultBoundaries.numBuckets()),
+		errors:  newBucket(errorBucketSize),
+	}
+	for i := range s.latency {
+		s.latency[i] = newBucket(latencyBucketSize)
+	}
+	return s
+}
+
+func (ss *sampleStore) perMethodSummary() *perMethodSummary {
+	ss.Lock()
+	defer ss.Unlock()
+	p := &perMethodSummary{}
+	p.errorSpans = ss.errors.len()
+	for _, b := range ss.latency {
+		p.latencySpans = append(p.latencySpans, b.len())
+	}
+	return p
+}
+
+func (ss *sampleStore) spansByLatency(latencyBucketIndex int) []sdktrace.ReadOnlySpan {
+	ss.Lock()
+	defer ss.Unlock()
+	if latencyBucketIndex < 0 || latencyBucketIndex >= len(ss.latency) {
+		return nil
+	}
+	return ss.latency[latencyBucketIndex].spans()
+}
+
+func (ss *sampleStore) errorSpans() []sdktrace.ReadOnlySpan {
+	ss.Lock()
+	defer ss.Unlock()
+	return ss.errors.spans()
+}
+
+// sampleSpan removes adds to the corresponding latency or error bucket.
+func (ss *sampleStore) sampleSpan(span sdktrace.ReadOnlySpan) {
+	code := span.Status().Code
+
+	ss.Lock()
+	defer ss.Unlock()
+	if code == codes.Error {
+		ss.errors.add(span)
+		return
+	}
+
+	// In case of time skew or wrong time, sample as 0 latency.
+	latency := max(span.EndTime().Sub(span.StartTime()), 0)
+	ss.latency[defaultBoundaries.getBucketIndex(latency)].add(span)
+}
+
+func spanKey(sc trace.SpanContext) [24]byte {
+	var sk [24]byte
+	tid := sc.TraceID()
+	copy(sk[0:16], tid[:])
+	sid := sc.SpanID()
+	copy(sk[16:24], sid[:])
+	return sk
+}

Server/vendor/go.opentelemetry.io/contrib/zpages/templates.go

@@ -0,0 +1,90 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+// Copyright 2017, OpenCensus 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 zpages // import "go.opentelemetry.io/contrib/zpages"
+
+import (
+	"fmt"
+	"html/template"
+	"io"
+	"log"
+
+	"go.opentelemetry.io/contrib/zpages/internal"
+)
+
+var (
+	templateFunctions = template.FuncMap{
+		"even":    even,
+		"spanRow": spanRowFormatter,
+	}
+	headerTemplate       = parseTemplate("header")
+	summaryTableTemplate = parseTemplate("summary")
+	tracesTableTemplate  = parseTemplate("traces")
+	footerTemplate       = parseTemplate("footer")
+)
+
+// headerData contains data for the header template.
+type headerData struct {
+	Title string
+}
+
+func parseTemplate(name string) *template.Template {
+	f, err := internal.Templates.Open("templates/" + name + ".html")
+	if err != nil {
+		log.Panicf("%v: %v", name, err) //nolint:revive  // Called during initialization.
+	}
+	defer func() {
+		if err = f.Close(); err != nil {
+			log.Panicf("%v: %v", name, err) //nolint:revive  // Called during initialization.
+		}
+	}()
+	text, err := io.ReadAll(f)
+	if err != nil {
+		log.Panicf("%v: %v", name, err) //nolint:revive  // Called during initialization.
+	}
+	return template.Must(template.New(name).Funcs(templateFunctions).Parse(string(text)))
+}
+
+func spanRowFormatter(r spanRow) template.HTML {
+	if !r.IsValid() {
+		return ""
+	}
+	col := "black"
+	if r.IsSampled() {
+		col = "blue"
+	}
+
+	tpl := fmt.Sprintf(
+		`trace_id: <b style="color:%s">%s</b> span_id: %s`,
+		col,
+		r.TraceID(),
+		r.SpanID(),
+	)
+	if r.ParentSpanContext.IsValid() {
+		tpl += fmt.Sprintf(` parent_span_id: %s`, r.ParentSpanContext.SpanID())
+	}
+
+	//nolint:gosec // G203: None of the dynamic attributes (TraceID/SpanID) can
+	// contain characters that need escaping so this lint issue is a false
+	// positive.
+	return template.HTML(tpl)
+}
+
+func even(x int) bool {
+	return x%2 == 0
+}

Server/vendor/go.opentelemetry.io/contrib/zpages/tracez.go

@@ -0,0 +1,267 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+// Copyright 2017, OpenCensus 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 zpages // import "go.opentelemetry.io/contrib/zpages"
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"sort"
+	"strconv"
+	"strings"
+	"time"
+
+	"go.opentelemetry.io/otel/attribute"
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
+	"go.opentelemetry.io/otel/trace"
+)
+
+const (
+	// spanNameQueryField is the header for span name.
+	spanNameQueryField = "zspanname"
+	// spanTypeQueryField is the header for type (running = 0, latency = 1, error = 2) to display.
+	spanTypeQueryField = "ztype"
+	// spanLatencyBucketQueryField is the header for latency based samples.
+	// Default is [0, 8] representing the latency buckets, where 0 is the first one.
+	spanLatencyBucketQueryField = "zlatencybucket"
+	// maxTraceMessageLength is the maximum length of a message in tracez output.
+	maxTraceMessageLength = 1024
+
+	maxRequestBodySize = 1 << 20 // 1MB
+)
+
+type summaryTableData struct {
+	Header             []string
+	LatencyBucketNames []string
+	Links              bool
+	TracesEndpoint     string
+	Rows               []summaryTableRowData
+}
+
+type summaryTableRowData struct {
+	Name    string
+	Active  int
+	Latency []int
+	Errors  int
+}
+
+// traceTableData contains data for the trace data template.
+type traceTableData struct {
+	Name string
+	Num  int
+	Rows []spanRow
+}
+
+var _ http.Handler = (*tracezHandler)(nil)
+
+type tracezHandler struct {
+	sp *SpanProcessor
+}
+
+// NewTracezHandler returns an http.Handler that can be used to serve HTTP requests for trace zpages.
+func NewTracezHandler(sp *SpanProcessor) http.Handler {
+	return &tracezHandler{sp: sp}
+}
+
+// ServeHTTP implements the http.Handler and is capable of serving "tracez" HTTP requests.
+func (th *tracezHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "text/html; charset=utf-8")
+
+	r.Body = http.MaxBytesReader(w, r.Body, maxRequestBodySize)
+	if err := r.ParseForm(); err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		return
+	}
+	spanName := r.Form.Get(spanNameQueryField)
+	spanType, _ := strconv.Atoi(r.Form.Get(spanTypeQueryField))
+	spanSubtype, _ := strconv.Atoi(r.Form.Get(spanLatencyBucketQueryField))
+
+	if err := headerTemplate.Execute(w, headerData{Title: "Trace Spans"}); err != nil {
+		log.Printf("zpages: executing template: %v", err)
+	}
+	if err := summaryTableTemplate.Execute(w, th.getSummaryTableData()); err != nil {
+		log.Printf("zpages: executing template: %v", err)
+	}
+	if spanName != "" {
+		if err := tracesTableTemplate.Execute(w, th.getTraceTableData(spanName, spanType, spanSubtype)); err != nil {
+			log.Printf("zpages: executing template: %v", err)
+		}
+	}
+	if err := footerTemplate.Execute(w, nil); err != nil {
+		log.Printf("zpages: executing template: %v", err)
+	}
+}
+
+func (th *tracezHandler) getTraceTableData(spanName string, spanType, latencyBucket int) traceTableData {
+	var spans []sdktrace.ReadOnlySpan
+	switch spanType {
+	case 0: // active
+		spans = th.sp.activeSpans(spanName)
+	case 1: // latency
+		spans = th.sp.spansByLatency(spanName, latencyBucket)
+	case 2: // error
+		spans = th.sp.errorSpans(spanName)
+	}
+
+	data := traceTableData{
+		Name: spanName,
+		Num:  len(spans),
+	}
+	for _, s := range spans {
+		data.Rows = append(data.Rows, spanRows(s)...)
+	}
+	return data
+}
+
+func (th *tracezHandler) getSummaryTableData() summaryTableData {
+	data := summaryTableData{
+		Links:          true,
+		TracesEndpoint: "tracez",
+	}
+	data.Header = []string{"Name", "active"}
+	// An implicit 0 lower bound latency bucket is always present.
+	latencyBuckets := append([]time.Duration{0}, defaultBoundaries.durations...)
+	for _, l := range latencyBuckets {
+		s := fmt.Sprintf(">%v", l)
+		data.Header = append(data.Header, s)
+		data.LatencyBucketNames = append(data.LatencyBucketNames, s)
+	}
+	data.Header = append(data.Header, "Errors")
+	for name, s := range th.sp.spansPerMethod() {
+		row := summaryTableRowData{Name: name, Active: s.activeSpans, Errors: s.errorSpans, Latency: s.latencySpans}
+		data.Rows = append(data.Rows, row)
+	}
+	sort.Slice(data.Rows, func(i, j int) bool {
+		return data.Rows[i].Name < data.Rows[j].Name
+	})
+	return data
+}
+
+type spanRow struct {
+	Fields [3]string
+	trace.SpanContext
+	ParentSpanContext trace.SpanContext
+}
+
+type events []sdktrace.Event
+
+func (e events) Len() int { return len(e) }
+func (e events) Less(i, j int) bool {
+	return e[i].Time.Before(e[j].Time)
+}
+func (e events) Swap(i, j int) { e[i], e[j] = e[j], e[i] }
+
+type attributes []attribute.KeyValue
+
+func (e attributes) Len() int { return len(e) }
+func (e attributes) Less(i, j int) bool {
+	return string(e[i].Key) < string(e[j].Key)
+}
+func (e attributes) Swap(i, j int) { e[i], e[j] = e[j], e[i] }
+
+func spanRows(s sdktrace.ReadOnlySpan) []spanRow {
+	start := s.StartTime()
+
+	lasty, lastm, lastd := start.Date()
+	wholeTime := func(t time.Time) string {
+		return t.Format("2006/01/02-15:04:05") + fmt.Sprintf(".%06d", t.Nanosecond()/1000)
+	}
+	formatTime := func(t time.Time) string {
+		y, m, d := t.Date()
+		if y == lasty && m == lastm && d == lastd {
+			return t.Format("           15:04:05") + fmt.Sprintf(".%06d", t.Nanosecond()/1000)
+		}
+		lasty, lastm, lastd = y, m, d
+		return wholeTime(t)
+	}
+
+	lastTime := start
+	formatElapsed := func(t time.Time) string {
+		d := t.Sub(lastTime)
+		lastTime = t
+		u := int64(d / 1000)
+		// There are five cases for duration printing:
+		// -1234567890s
+		// -1234.123456
+		//      .123456
+		// 12345.123456
+		// 12345678901s
+		switch {
+		case u < -9999999999:
+			return fmt.Sprintf("%11ds", u/1e6)
+		case u < 0:
+			sec := u / 1e6
+			u -= sec * 1e6
+			return fmt.Sprintf("%5d.%06d", sec, -u)
+		case u < 1e6:
+			return fmt.Sprintf("     .%6d", u)
+		case u <= 99999999999:
+			sec := u / 1e6
+			u -= sec * 1e6
+			return fmt.Sprintf("%5d.%06d", sec, u)
+		default:
+			return fmt.Sprintf("%11ds", u/1e6)
+		}
+	}
+
+	firstRow := spanRow{Fields: [3]string{wholeTime(start), "", ""}, SpanContext: s.SpanContext(), ParentSpanContext: s.Parent()}
+	if s.EndTime().IsZero() {
+		firstRow.Fields[1] = "            "
+	} else {
+		firstRow.Fields[1] = formatElapsed(s.EndTime())
+		lastTime = start
+	}
+	out := []spanRow{firstRow}
+
+	formatAttributes := func(a attributes) string {
+		sort.Sort(a)
+		var s []string
+		for i := range a {
+			s = append(s, fmt.Sprintf("%s=%v", a[i].Key, a[i].Value.Emit()))
+		}
+		return "Attributes:{" + strings.Join(s, ", ") + "}"
+	}
+
+	msg := fmt.Sprintf("Status{Code=%s, description=%q}", s.Status().Code.String(), s.Status().Description)
+	out = append(out, spanRow{Fields: [3]string{"", "", msg}})
+
+	if len(s.Attributes()) != 0 {
+		out = append(out, spanRow{Fields: [3]string{"", "", formatAttributes(s.Attributes())}})
+	}
+
+	es := events(s.Events())
+	sort.Sort(es)
+	for _, e := range es {
+		msg := e.Name
+		if len(e.Attributes) != 0 {
+			msg = msg + "  " + formatAttributes(e.Attributes)
+		}
+		row := spanRow{Fields: [3]string{
+			formatTime(e.Time),
+			formatElapsed(e.Time),
+			msg,
+		}}
+		out = append(out, row)
+	}
+	for i := range out {
+		if len(out[i].Fields[2]) > maxTraceMessageLength {
+			out[i].Fields[2] = out[i].Fields[2][:maxTraceMessageLength]
+		}
+	}
+	return out
+}

Server/vendor/go.opentelemetry.io/contrib/zpages/version.go

@@ -0,0 +1,7 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package zpages // import "go.opentelemetry.io/contrib/zpages"
+
+// Version is the current release version of the zpages span processor.
+const Version = "0.68.0"