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+A80: gRPC Metrics for TCP connection
+----
+* Author(s):  Yash Tibrewal (@yashykt), Nana Pang (@nanahpang), Yousuk Seung (@yousukseung)
+* Approver: Craig Tiller (@ctiller), Mark Roth (@markdroth)
+* Status: {Draft, In Review, Ready for Implementation, Implemented}
+* language: {...}
+* Last updated: 2024-04-18
+* Discussion at: https://groups.google.com/g/grpc-io/c/AyT0LVgoqFs
+
+## Abstract
+
+This document proposes adding new TCP connection metrics to gRPC for improved network analysis and debugging.
+
+## Background
+
+To improve the network debugging capabilities for gRPC users, we propose adding per-connection TCP metrics in gRPC. The metrics will utilize the metrics framework outlined in  [A79].
+
+### Related Proposals: 
+* [A79]: gRPC Non-Per-Call Metrics Framework
+
+[A79]: A79-non-per-call-metrics-architecture.md
+
+## Proposal
+
+This document proposes changes to the following gRPC components.
+
+### Per-Connection TCP Metrics
+
+We will provide the following metrics:
+- `grpc.tcp.min_rtt`
+- `grpc.tcp.delivery_rate`
+- `grpc.tcp.packets_sent`
+- `grpc.tcp.packets_retransmitted`
+- `grpc.tcp.packets_spurious_retransmitted`
+
+The metrics will be exported as:
+
+| Name          | Type  | Unit  | Labels  | Description |
+| ------------- | ----- | ----- | ------- | ----------- |
+| grpc.tcp.min_rtt | Histogram (floating-point) | s | None | Records TCP's current estimate of minimum round trip time (RTT), typically used as an indication of the network health between two endpoints.<br /> RTT = packet acked timestamp - packet sent timestamp. |
+| grpc.tcp.delivery_rate | Histogram (floating-point) | bit/s | None | Records latest goodput measured of the TCP connection. <br /> Elapsed time = packet acked timestamp - last packet acked timestamp. <br /> Delivery rate = packet acked bytes / elapsed time. |
+| grpc.tcp.packets_sent | Counter (integer) | {packet} | None | Records total packets TCP sends in the calculation period. |
+| grpc.tcp.packets_retransmitted | Counter (integer) | {packet} | None | Records total packets lost in the calculation period, including lost or spuriously retransmitted packets. |
+| grpc.tcp.packets_spurious_retransmitted | Counter (integer) | {packet} | None | Records total packets spuriously retransmitted packets in the calculation period. These are retransmissions that TCP later discovered unnecessary.|
+
+#### Metric Collection Design
+
+A high-level approach to collecting TCP metrics (on Linux) is as follows:
+1) **Enable Network Timestamps for Metric Calculation:** Enable the `SO_TIMESTAMPING` option in the kernel's TCP stack through the `setsocketopt(fd, SOL_SOCKET, SO_TIMESTAMPING, &val, sizeof(val))` system call. This enables the kernel to capture packet timestamps during transmission.
+2) **Calculate Metrics from Timestamps:**  Linux kernel calculates TCP connection metrics based on the captured packet timestamps. These metrics can be retrieved using the `getsockopt(TCP_INFO)` system call. For example, the delivery_rate metric estimates the goodput—the rate of useful data transmitted—for the most recent group of outbound data packets within a single flow ([code](https://elixir.bootlin.com/linux/v5.11.1/source/net/ipv4/tcp.c#L391)).
+3) **Periodically Collect Statistics:** At a specified time interval (e.g., every 5 minutes), gRPC aggregates the calculated metrics and updates the corresponding statistics records.
+
+A detailed explanation of the design can be found in the Fathom documentation.
+
+#### Reference: 
+* Fathom: https://dl.acm.org/doi/pdf/10.1145/3603269.3604815
+* Kernel TCP Timestamping: https://www.kernel.org/doc/Documentation/networking/timestamping.rst
+* Delivery Rate: https://datatracker.ietf.org/doc/html/draft-cheng-iccrg-delivery-rate-estimation#name-delivery-rate
+
+### Metric Stability
+
+All metrics added in this proposal will start as experimental. The long term goal will be to
+de-experimentalize them and have them be on by default, but the exact
+criteria for that change are TBD.
+
+### Temporary environment variable protection
+
+This proposal does not include any features enabled via external I/O, so
+it does not need environment variable protection.
+
+## Implementation
+
+Will be implemented in C-core, and currently have no plans to implement in other languages.