#20365

Committed 27 Jul 2026 06:04AM UTC coverage: 89.199% (+0.07%) from 89.125%

Build # #20365

Build Type

push

github

Committed by

web-flow

Commit Message

core: Implement LB Delay Observability (Proposal A121) (#12807)

This PR implements **Attempt-Level RPC Delay Observability** across the core channel transport, built-in load balancers, xDS policies, and the OpenTelemetry telemetry plugin, aligned with [gRPC Proposal A121](https://github.com/grpc/proposal/pull/556).

Coverage Stats

38276 of 42911 relevant lines covered (89.2%)

0.89 hits per line

Source File
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70.0

/../core/src/main/java/io/grpc/internal/ForwardingClientStreamTracer.java

/*
 * Copyright 2021 The gRPC 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 io.grpc.internal;

import com.google.common.base.MoreObjects;
import io.grpc.Attributes;
import io.grpc.ClientStreamTracer;
import io.grpc.Metadata;
import io.grpc.Status;

public abstract class ForwardingClientStreamTracer extends ClientStreamTracer {

  /**
   * Returns the underlying {@code ClientStreamTracer}.
   */
  protected abstract ClientStreamTracer delegate();

  @Override
  public void streamCreated(Attributes transportAttrs, Metadata headers) {
    delegate().streamCreated(transportAttrs, headers);
  }

  @Override
  public void createPendingStream() {
    delegate().createPendingStream();
  }

  @Override
  public void recordAttemptDelayStart(String delayType, String delayReason) {
    delegate().recordAttemptDelayStart(delayType, delayReason);
  }

  @Override
  public void recordAttemptDelayReasonChanged(String delayReason) {
    delegate().recordAttemptDelayReasonChanged(delayReason);
  }

  @Override
  public void recordAttemptDelayEnd() {
    delegate().recordAttemptDelayEnd();
  }

  @Override
  public void outboundHeaders() {
    delegate().outboundHeaders();
  }

  @Override
  public void inboundHeaders() {
    delegate().inboundHeaders();
  }

  @Override
  public void inboundHeaders(Metadata headers) {
    delegate().inboundHeaders(headers);
  }

  @Override
  public void inboundTrailers(Metadata trailers) {
    delegate().inboundTrailers(trailers);
  }

  @Override
  public void addOptionalLabel(String key, String value) {
    delegate().addOptionalLabel(key, value);
  }

  @Override
  public void streamClosed(Status status) {
    delegate().streamClosed(status);
  }

  @Override
  public void outboundMessage(int seqNo) {
    delegate().outboundMessage(seqNo);
  }

  @Override
  public void inboundMessage(int seqNo) {
    delegate().inboundMessage(seqNo);
  }

  @Override
  public void outboundMessageSent(int seqNo, long optionalWireSize, long optionalUncompressedSize) {
    delegate().outboundMessageSent(seqNo, optionalWireSize, optionalUncompressedSize);
  }

  @Override
  public void inboundMessageRead(int seqNo, long optionalWireSize, long optionalUncompressedSize) {
    delegate().inboundMessageRead(seqNo, optionalWireSize, optionalUncompressedSize);
  }

  @Override
  public void outboundWireSize(long bytes) {
    delegate().outboundWireSize(bytes);
  }

  @Override
  public void outboundUncompressedSize(long bytes) {
    delegate().outboundUncompressedSize(bytes);
  }

  @Override
  public void inboundWireSize(long bytes) {
    delegate().inboundWireSize(bytes);
  }

  @Override
  public void inboundUncompressedSize(long bytes) {
    delegate().inboundUncompressedSize(bytes);
  }

  @Override
  public String toString() {
    return MoreObjects.toStringHelper(this).add("delegate", delegate()).toString();
  }
}

1	/*
2	* Copyright 2021 The gRPC Authors
3	*
4	* Licensed under the Apache License, Version 2.0 (the "License");
5	* you may not use this file except in compliance with the License.
6	* You may obtain a copy of the License at
7	*
8	* http://www.apache.org/licenses/LICENSE-2.0
9	*
10	* Unless required by applicable law or agreed to in writing, software
11	* distributed under the License is distributed on an "AS IS" BASIS,
12	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13	* See the License for the specific language governing permissions and
14	* limitations under the License.
15	*/
16
17	package io.grpc.internal;
18
19	import com.google.common.base.MoreObjects;
20	import io.grpc.Attributes;
21	import io.grpc.ClientStreamTracer;
22	import io.grpc.Metadata;
23	import io.grpc.Status;
24
25	public abstract class ForwardingClientStreamTracer extends ClientStreamTracer {	1✔
26
27	/**
28	* Returns the underlying {@code ClientStreamTracer}.
29	*/
30	protected abstract ClientStreamTracer delegate();
31
32	@Override
33	public void streamCreated(Attributes transportAttrs, Metadata headers) {
34	delegate().streamCreated(transportAttrs, headers);	1✔
35	}	1✔
36
37	@Override
38	public void createPendingStream() {
39	delegate().createPendingStream();	1✔
40	}	1✔
41
42	@Override
43	public void recordAttemptDelayStart(String delayType, String delayReason) {
44	delegate().recordAttemptDelayStart(delayType, delayReason);	1✔
45	}	1✔
46
47	@Override
48	public void recordAttemptDelayReasonChanged(String delayReason) {
49	delegate().recordAttemptDelayReasonChanged(delayReason);	1✔
50	}	1✔
51
52	@Override
53	public void recordAttemptDelayEnd() {
54	delegate().recordAttemptDelayEnd();	1✔
55	}	1✔
56
57	@Override
58	public void outboundHeaders() {
59	delegate().outboundHeaders();	1✔
60	}	1✔
61
62	@Override
63	public void inboundHeaders() {
64	delegate().inboundHeaders();	1✔
65	}	1✔
66
67	@Override
68	public void inboundHeaders(Metadata headers) {
69	delegate().inboundHeaders(headers);	1✔
70	}	1✔
71
72	@Override
73	public void inboundTrailers(Metadata trailers) {
74	delegate().inboundTrailers(trailers);	1✔
75	}	1✔
76
77	@Override
78	public void addOptionalLabel(String key, String value) {
79	delegate().addOptionalLabel(key, value);	1✔
80	}	1✔
81
82	@Override
83	public void streamClosed(Status status) {
84	delegate().streamClosed(status);	1✔
85	}	1✔
86
87	@Override
88	public void outboundMessage(int seqNo) {
89	delegate().outboundMessage(seqNo);	×
90	}	×
91
92	@Override
93	public void inboundMessage(int seqNo) {
94	delegate().inboundMessage(seqNo);	1✔
95	}	1✔
96
97	@Override
98	public void outboundMessageSent(int seqNo, long optionalWireSize, long optionalUncompressedSize) {
99	delegate().outboundMessageSent(seqNo, optionalWireSize, optionalUncompressedSize);	×
100	}	×
101
102	@Override
103	public void inboundMessageRead(int seqNo, long optionalWireSize, long optionalUncompressedSize) {
104	delegate().inboundMessageRead(seqNo, optionalWireSize, optionalUncompressedSize);	1✔
105	}	1✔
106
107	@Override
108	public void outboundWireSize(long bytes) {
109	delegate().outboundWireSize(bytes);	×
110	}	×
111
112	@Override
113	public void outboundUncompressedSize(long bytes) {
114	delegate().outboundUncompressedSize(bytes);	×
115	}	×
116
117	@Override
118	public void inboundWireSize(long bytes) {
119	delegate().inboundWireSize(bytes);	×
120	}	×
121
122	@Override
123	public void inboundUncompressedSize(long bytes) {
124	delegate().inboundUncompressedSize(bytes);	×
125	}	×
126
127	@Override
128	public String toString() {
129	return MoreObjects.toStringHelper(this).add("delegate", delegate()).toString();	1✔
130	}
131	}

grpc / grpc-java / #20365

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