Add `aws-smithy-observability` and `aws-smithy-observability-otel` crates #3912

landonxjames · 2024-11-11T20:04:51Z

Motivation and Context

We would like to have a consistent way to measure the performance of the SDK going forward so we can evaluate how updates change the performance over time. The changes in this PR are a first step towards that, adding the interfaces (and one implementation) that we will use to instrument our runtime crates.

Description

Add two new crates

aws-smithy-observability - contains traits for our observability solution and a global module for managing the global telemetry provider
aws-smithy-observability-otel - contains an OpenTelemetry based implementation of the traits

Testing

Added new tests in both crates

Checklist

Note: leaving out a changelog entry for now since these crates are somewhat useless until we instrument our runtime crates

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

github-actions · 2024-11-11T20:21:35Z

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rust-runtime/aws-smithy-observability-otel/Cargo.toml

github-actions · 2024-11-12T15:51:51Z

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aajtodd

Good start but I have some questions and concerns to be discussed.

rust-runtime/aws-smithy-observability/README.md

aajtodd · 2024-11-12T16:17:38Z

rust-runtime/aws-smithy-observability/src/meter.rs

+/// Provides named instances of [Meter].
+pub trait MeterProvider {
+    /// Get or create a named [Meter].
+    fn get_meter(&self, scope: &'static str, attributes: Option<&Attributes>) -> Box<dyn Meter>;


discuss Should this be -> impl Meter?

I don't think that would work. Returning impl Meter would make MeterProvider not object safe and so we couldn't pass it around as a dyn everywhere.

From docs:

All associated functions must either be dispatchable from a trait object or be explicitly non-dispatchable:

Dispatchable functions must:

Not have an opaque return type; that is,

Not have a return position impl Trait type (fn example(&self) -> impl Trait).

rust-runtime/aws-smithy-observability/src/meter.rs

aajtodd · 2024-11-12T16:20:19Z

rust-runtime/aws-smithy-observability/src/meter.rs

+        callback: Box<dyn Fn(&dyn AsyncMeasurement<Value = f64>) + Send + Sync>,
+        units: Option<String>,
+        description: Option<String>,
+    ) -> Box<dyn AsyncMeasurement<Value = f64>>;


Same question should these be Box<T> or should they be impl -> T?

See response above, using impl T would make these not object safe
#3912 (comment)

aajtodd · 2024-11-12T16:22:07Z

rust-runtime/aws-smithy-observability/src/meter.rs

+    #[allow(clippy::type_complexity)]
+    fn create_gauge(
+        &self,
+        name: String,


These should probably be more flexible like impl Into<String> or impl Into<Cow<'static, str>>, etc.

I tried that, but once again it makes the Meter trait no longer object safe

aajtodd · 2024-11-12T16:37:23Z

rust-runtime/aws-smithy-observability/src/provider.rs

+    }
+
+    /// Get the set [MeterProvider]
+    pub fn meter_provider(&self) -> &(dyn MeterProvider + Send + Sync) {


should this return impl MeterProvider + Send + Sync?

I don't think you can return a reference to an impl Trait, and I didn't want to hand ownership of the MeterProvider to the caller, so settled for the &dyn that is there now.

aajtodd · 2024-11-12T16:41:18Z

rust-runtime/aws-smithy-observability/src/lib.rs

+//TODO(smithyobservability): once we have finalized everything and integrated metrics with our runtime
+// libraries update this with detailed usage docs and examples
+
+pub mod attributes;


Several of these modules probably should be private and just re-export their type instead.

use aws_smithy_observability::Error; use aws_smithy_observability::Attributes`

vs

use aws_smithy_observability::error::Error; use aws_smithy_observability::attributes::Attributes`

In other words consider how you'd like the API to be exposed and consumed.

Also missing docs on public modules.

Added some pub uses for these types in 0559e8b

The public modules are already documented, but the docs are in the module file instead of in lib.rs. I prefer keeping them there because I think it is cleaner than putting them all in lib.rs, but will move them if that is a consensus.

rust-runtime/aws-smithy-observability/src/attributes.rs

rust-runtime/aws-smithy-observability/src/meter.rs

aajtodd · 2024-11-12T16:49:39Z

rust-runtime/aws-smithy-observability/src/meter.rs

+}
+
+/// Collects a set of events with an event count and sum for all events.
+pub trait Histogram {


Do we need to consider whether we want to force (or need) instrument types to implement Clone?

Sized is a supertrait of Clone and Sized supertraits break object safety

ysaito1001

Thanks for the work! Will circle back, leaving initial comments...

rust-runtime/aws-smithy-observability-otel/Cargo.toml

rust-runtime/aws-smithy-observability-otel/src/attributes.rs

rust-runtime/aws-smithy-observability-otel/src/meter.rs

rust-runtime/aws-smithy-observability/src/meter.rs

github-actions · 2024-11-13T21:53:45Z

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AWS SDK (ignoring whitespace)
Client Test (ignoring whitespace)
No codegen difference in the Server Test
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rust-runtime/aws-smithy-observability/src/meter.rs

ysaito1001 · 2024-11-14T17:23:52Z

I see that the design specifies an async API such as create_guage returns an async measurement handle. Do we need to support that, not necessarily in this PR but before the aws-smithy-observability goes 1.0 (in which case, like many traits do in the smithy runtime crates, a trait needs to return a struct and that struct implements the Future trait)?

github-actions · 2024-11-18T02:36:40Z

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landonxjames · 2024-11-18T22:16:34Z

I see that the design specifies an async API such as create_guage returns an async measurement handle. Do we need to support that, not necessarily in this PR but before the aws-smithy-observability goes 1.0 (in which case, like many traits do in the smithy runtime crates, a trait needs to return a struct and that struct implements the Future trait)?

The AsyncMeasurement name is kind of a confusing one in Rust since it doesn't really map to async fn, but is really a synchronous callback function registered when the instrument is created that is invoked when a instrument is observed. This bit in the SRA was inspired by OpenTelemetry and you can see their description of it here and their Rust implementation of it here

github-actions · 2024-11-18T22:38:35Z

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github-actions · 2024-11-19T23:25:38Z

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github-actions · 2024-11-20T00:16:55Z

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ysaito1001

Thanks for the great work! Left the final round of comments.

rust-runtime/aws-smithy-observability/src/attributes.rs

rust-runtime/aws-smithy-observability/src/global.rs

github-actions · 2024-11-21T18:45:43Z

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github-actions · 2024-11-21T23:14:40Z

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github-actions · 2024-11-22T18:39:15Z

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github-actions · 2024-11-23T04:22:48Z

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github-actions · 2024-11-25T20:53:17Z

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github-actions · 2024-12-02T17:20:12Z

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Also fix all warnings in both observability crates

The updates caused CI to fail since it depended on the newly added crates, but those were not yet present in the main lockfile that is copied around for tests

* Update some clippy style issues * Config the aws-smithy-observability-otel crate to not compile on powerpc * Run tests for global module serially so they don't poison the RwLock

Pin version of value-bag in otel crate Powerpc dep updates Pin more transitive deps

Co-authored-by: Zelda Hessler <[email protected]>

Aligns with standard introduced in #3065 Update doc comments External types updates

Remove non-public type from docs

github-actions · 2024-12-03T20:26:45Z

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AWS SDK (ignoring whitespace)
Client Test (ignoring whitespace)
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landonxjames changed the title ~~Landonxjames/obs~~ Add aws-smithy-observability and aws-smithy-observability-otel crates Nov 11, 2024

landonxjames marked this pull request as ready for review November 11, 2024 20:34

landonxjames requested review from a team as code owners November 11, 2024 20:34

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landonxjames force-pushed the landonxjames/obs branch from 71cd2ef to 0559e8b Compare November 18, 2024 01:48

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landonxjames force-pushed the landonxjames/obs branch from 9f0df17 to 4e11e53 Compare November 21, 2024 22:56

landonxjames enabled auto-merge November 25, 2024 17:52

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landonxjames force-pushed the landonxjames/obs branch from b964231 to 05bb688 Compare November 25, 2024 20:35

landonxjames and others added 22 commits December 3, 2024 12:07

First impl of Metrics interfaces

e28c040

Updates to observability interfaces

33097b2

Chunk of the Otel TelemetryProvider impled

c5baff6

Pausing work on metering

c3a78c8

Further along piping callback through telemetry

1028a77

First compiling pass of Otel metrics impl

9ea0d77

Add initial working test for otel metric provider

d7f3484

Add tests for Otel/Sdk attribute conversions

b128fe8

Also fix all warnings in both observability crates

Add testing to aws-smithy-observability-otel crate

9d13dd5

Cleaning up some tests and doc comments

0b209b4

Update READMEs leave TODO about adding usage docs

ae8b6a8

Revert changes to rust-runtime/Cargo.lock

16486cd

The updates caused CI to fail since it depended on the newly added crates, but those were not yet present in the main lockfile that is copied around for tests

Updates for CI failures

e27b5b3

* Update some clippy style issues * Config the aws-smithy-observability-otel crate to not compile on powerpc * Run tests for global module serially so they don't poison the RwLock

Update rust-runtime/Cargo.lock to get around CI issues

b5397de

Exclude otel dependencies from powerpc target_arch

1371160

Pin version of value-bag in otel crate Powerpc dep updates Pin more transitive deps

Update external types for observability crates

1237ce6

Update rust-runtime/aws-smithy-observability-otel/Cargo.toml

e2c4728

Co-authored-by: Zelda Hessler <[email protected]>

PR feedback

b8fa732

Add Send + Sync + Debug supertraits to obs traits

d4ffb43

Rename some traits to be more verby

3aab982

Aligns with standard introduced in #3065 Update doc comments External types updates

PR feedback

d8b519d

Remove non-public type from docs

Refactor get/set_telemetry_provider functions to return Result

ca9d3ba

landonxjames force-pushed the landonxjames/obs branch from 9de88de to ca9d3ba Compare December 3, 2024 20:08

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Add `aws-smithy-observability` and `aws-smithy-observability-otel` crates #3912

Add `aws-smithy-observability` and `aws-smithy-observability-otel` crates #3912

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Add aws-smithy-observability and aws-smithy-observability-otel crates #3912

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Add aws-smithy-observability and aws-smithy-observability-otel crates #3912

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landonxjames commented Nov 11, 2024

Motivation and Context

Description

Testing

Checklist

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Add `aws-smithy-observability` and `aws-smithy-observability-otel` crates #3912

Add `aws-smithy-observability` and `aws-smithy-observability-otel` crates #3912