Aligning metrics with OTel semantic conventions #4482

xakep139 · 2023-09-27T16:32:51Z

Fixes #4432

The final names are:

Meter Microsoft.Extensions.Diagnostics.ResourceMonitoring:

Observable Gauge process.cpu.utilization, unit 1, values: 0.0 - 1.0
Observable Gauge dotnet.process.memory.virtual.utilization, unit 1, values: 0.0 - 1.0
Observable UpDownCounter system.network.connections, unit {connection}, tags/attributes:
- network.transport = tcp
- network.type = [ipv4, ipv6]
- system.network.state = [close, close_wait, closing, delete, established, fin_wait_1, fin_wait_2, last_ack, listen, syn_recv, syn_sent, time_wait]

Meter Microsoft.AspNetCore.HeaderParsing:

Counter aspnetcore.header_parsing.parse_errors, tags/attributes:
- error.type
- aspnetcore.header_parsing.header.name
Counter aspnetcore.header_parsing.cache_accesses, tags/attributes:
- aspnetcore.header_parsing.header.name
- aspnetcore.header_parsing.cache_access.type

Meter Microsoft.Extensions.Diagnostics.HealthChecks:

Counter dotnet.health_check.reports, tags/attributes:
- dotnet.health_check.status of type HealthStatus, [Degraded, Healthy, Unhealthy]
Counter dotnet.health_check.unhealthy_checks, tags/attributes:
- dotnet.health_check.name
- dotnet.health_check.status of type HealthStatus, [Degraded, Healthy, Unhealthy]

Resilience tags for enrichment:

error.type
request.dependency.name - to correlate with HttpClient metrics
request.name - to correlate with HttpClient metrics

Microsoft Reviewers: Open in CodeFlow

martintmk · 2023-09-29T07:05:06Z

Can you also align the resilience tags?

https://github.com/dotnet/extensions/blob/main/src/Libraries/Microsoft.Extensions.Resilience/Resilience/Internal/ResilienceTagNames.cs

xakep139 · 2023-09-29T08:52:19Z

Can you also align the resilience tags?

https://github.com/dotnet/extensions/blob/main/src/Libraries/Microsoft.Extensions.Resilience/Resilience/Internal/ResilienceTagNames.cs

Surely I will, thanks for pointing that out

noahfalk · 2023-10-05T02:32:22Z

@lmolkova - are you interested in taking a look at these?

reyang · 2023-10-05T02:43:13Z

...Libraries/Microsoft.Extensions.Diagnostics.ResourceMonitoring/ResourceUtilizationCounters.cs

 /// </remarks>
 /// <seealso cref="System.Diagnostics.Metrics.Instrument"/>
 public static class ResourceUtilizationCounters
 {
    /// <summary>
-    /// Gets the CPU consumption of the running application in percentages.
+    /// Gets the CPU consumption of the running application in range <c>[0, 1]</c>.


I have a stepping back question regarding all utilizations measured by %.

Related discussions and PRs:

Runtime instrumentation: Can time-in-gc metric be published ? open-telemetry/opentelemetry-dotnet-contrib#1163 (comment)

[Instrumentation.Process] Added the metrics for CpuTime and CpuUtilization. open-telemetry/opentelemetry-dotnet-contrib#625 (comment)

[Instrumentation.Process] Added Cpu related metrics and addressed comments. open-telemetry/opentelemetry-dotnet-contrib#612 (comment)

FYI @noahfalk IIRC for garbage collector metrics we decided to use absolute value (e.g. total time spent in GC since the beginning of the process lifecycle), and encourage users to derive utilization based on their actual need (so the user can choose whatever sliding window and sampling frequency).

As I recall this component has a sampling mechanism and sliding window built into it and the app developer can configure some of those parameters or accept defaults. So when this component reports an instantaneous utilization measurement of 73%, it really means that over the last X minutes some aggregation of Y CPU usage samples had an average CPU utilization of 73% for the app developer's chosen X and Y. Its not the pattern I'd expect most metrics to follow as there is extra implementation complexity and it can't accurately be re-aggregated to compute other sliding windows later. However because the app developer configures a sampling window of known fixed size it doesn't suffer from the issues that those other metrics had where they inferred a sample window from the polling frequency or from some unpredictable process behavior.

A while back I encouraged the engineers who were working on this to simplify and not maintain their own sliding window sampling reservoir, but I feel like what is there now is still well defined and likely useful as long as the sampling window is configured well up-front. I didn't object to this even though I expect metrics of this style will be an outlier in the long run. Having something like this shouldn't block us from later creating an alternate metric that emits absolute measures of CPU and memory usage with more aggregation flexibility.

@reyang do you feel like that addresses your concerns or you are still worried here?

I'm not too concerned about having alternative metrics that customers can conveniently use - as long as there is clarity:

What exactly does this metric mean. Refer to https://github.com/dotnet/extensions/pull/4482/files#r1347628433.

What's the recommendation if there are multiple ways to get similar things - e.g. pros/cons, pitfalls, best practices. For example, https://github.com/open-telemetry/opentelemetry-dotnet-contrib/tree/main/src/OpenTelemetry.Instrumentation.Process.

What's the recommendation if there are multiple ways to get similar things - e.g. pros/cons, pitfalls, best practices. For example, https://github.com/open-telemetry/opentelemetry-dotnet-contrib/tree/main/src/OpenTelemetry.Instrumentation.Process.

@noahfalk given OpenTelemetry.Instrumentation.Process is still in Preview, I think we should make a decision about the direction - e.g. all CPU/Memory metrics will be exposed by Microsoft.Extensions.Diagnostics.ResourceMonitoring, and we will deprecate OpenTelemetry.Instrumentation.Process and point customers to Microsoft.Extensions.Diagnostics.ResourceMonitoring. Meanwhile we'll make sure Microsoft.Extensions.Diagnostics.ResourceMonitoring works for all supported version of the runtime + operating systems. Does this make sense and do you feel we can make a call before .NET 8 GA?

@Yun-Ting FYI since you've worked on OpenTelemetry.Instrumentation.Process.

My thought would be:
In .NET 8 - Point devs to these ResourceMonitoring metrics. Either deprecate OTel.Instrumentation.Process or adjust guidance so that we only suggest it only as a fallback for devs that need the metric in a specific form not already handled by ResourceMonitoring.

In the future (.NET 9?) - Implement the core CPU + memory metrics currently in OTel.Instrumentation.Process inside System.Diagnostic.DiagnosticSource. I think metrics like process.cpu.time or process.memory.virtual are so commonly desired that we shouldn't be asking devs to add extra library dependencies or new background polling services (serviceCollection.AddResourceMonitoring()) in order to enable them. At this point ResourceMonitoring would serve two roles going forward: (1) support for networking metrics which are a little more involved to configure (2) back-compat for projects already using the other process metrics defined here and wanting to continue doing so.

What does everyone think?

My thought would be: In .NET 8 - Point devs to these ResourceMonitoring metrics.

Just confirming - point devs that are using any supported version of .NET (core/framework), not just limited to folks who use .NET 8?

Yeah, I meant as of November 2023 (or whenever this assembly releases as stable), all .NET devs should be able to use ResourceMonitoring to satisfy their need for CPU/Virtual Memory metrics.

NOTE: After I wrote that I saw that this library has a weirdly inconsistent approach to how it measures memory. I'm presuming that gets resolved. If it didn't then I wouldn't feel comfortable recommending it.

...raries/Microsoft.Extensions.Diagnostics.ResourceMonitoring/Linux/LinuxUtilizationProvider.cs

src/Libraries/Microsoft.AspNetCore.HeaderParsing/Metric.cs

src/Libraries/Microsoft.Extensions.Diagnostics.HealthChecks.Common/Metric.cs

noahfalk · 2023-10-05T02:45:03Z

src/Libraries/Microsoft.Extensions.Diagnostics.HealthChecks.Common/Metric.cs

    public static partial HealthCheckReportCounter CreateHealthCheckReportCounter(Meter meter);

-    [Counter("name", "status", Name = @"R9\\HealthCheck\\UnhealthyHealthCheck")]
+    [Counter("health_check.name", "health.status", Name = "health_check.unhealthy_checks")]


Fyi @timmydo - A little while back you were looking for a counter on health checks. Perhaps this functionality matches what you wanted?

...Libraries/Microsoft.Extensions.Diagnostics.ResourceMonitoring/ResourceUtilizationCounters.cs

Co-authored-by: Noah Falk <[email protected]>

...raries/Microsoft.Extensions.Diagnostics.ResourceMonitoring/Linux/LinuxUtilizationProvider.cs

src/Libraries/Microsoft.Extensions.Diagnostics.ResourceMonitoring/Windows/WindowsCounters.cs

…/MetricCollector.cs

src/Libraries/Microsoft.Extensions.Resilience/Resilience/Internal/ResilienceTagNames.cs

lmolkova · 2023-10-13T22:48:39Z

src/Libraries/Microsoft.Extensions.Resilience/Resilience/Internal/ResilienceTagNames.cs


-    public const string FailureReason = "failure-reason";
+    public const string FailureReason = "resilience.failure.reason";


based on what I see here https://github.com/dotnet/extensions/blob/main/src/Libraries/Microsoft.Extensions.Resilience/Resilience/Internal/ResilienceMetricsEnricher.cs, we can use error.type attribute here (and full exception name)

One note ere. These are just additional tags on top of the ones built-in into Polly:
https://www.pollydocs.org/advanced/telemetry.html#metrics

One of the tags is exception.type one as defined by:
https://opentelemetry.io/docs/specs/otel/trace/exceptions/

There is an intersection here between exception.type and error.type and I am wondering how should we handle this.

Just for context:

This is how HttpResponseMessage is translated into FailureResultContext:

extensions/src/Libraries/Microsoft.Extensions.Http.Resilience/Resilience/ResilienceHttpClientBuilderExtensions.Resilience.cs

Line 156 in 1247364

return FailureResultContext.Create(

And this is how exceptions are translated:

extensions/src/Libraries/Microsoft.Extensions.Resilience/Resilience/Internal/ResilienceMetricsEnricher.cs

Line 37 in 1247364

context.Tags.Add(new(ResilienceTagNames.FailureSource, e.Source));

Can we trim the FailureResultContext or maybe just expose add the following tags?

error.summary: will be status code such as 500 for HttpResponseMessage or exception summary for exceptions.

exception.source: applicable only for exceptions (or even don't add anything here)

thank you for the context!

To the original comment: if polly already reports exception.type, is there any reason to report resilience.failure.reason at all since it's always an exception type?

Can we trim the FailureResultContext or maybe just expose add the following tags?

error.summary: will be status code such as 500 for HttpResponseMessage or exception summary for exceptions.
exception.source: applicable only for exceptions (or even don't add anything here)

I'd avoid adding new tags to OTel-defined namespaces - this is against OTel recommendations https://github.com/open-telemetry/opentelemetry-specification/blob/563958cb2bd8529990f19fdce7a5f3643bf63091/specification/common/attribute-naming.md?plain=1#L128

But I believe that if the exception summary has low cardinality, you can put it into error.type attribute which is intended to capture all kinds of error codes and fallback to (full) exception type.

We can also introduce dotnet.exception.source attribute and (hopefully) reuse in other parts of .NET and 3rd party libraries.

I agree with having just:

error.type - to represent both exception summary and the failure reason for results

dotnet.exception.source

And at initial release we won't add tags for the following properties?

FailureResultContext.Source

FailureResultContext.AdditionalInformation

extensions/src/Libraries/Microsoft.Extensions.Resilience/Resilience/FailureResultContext.cs

Line 13 in 261b354

public readonly struct FailureResultContext

Maybe we can slim the FailureResultContext down then, or maybe completely drop it. This is because the Polly v8 supports registering custom enrichers and we can just register HTTP-based enricher to Polly directly without having additional layers?

cc @geeknoid

PR with the changes is up:

#4600

src/Libraries/Microsoft.Extensions.Resilience/Resilience/Internal/ResilienceTagNames.cs

geeknoid · 2023-10-16T18:47:42Z

@xakep139 Is this ready to go in?

xakep139 · 2023-10-17T18:31:58Z

@xakep139 Is this ready to go in?

Not yet, I need to address latest feedback that @lmolkova left

…ing/Windows/WindowsCounters.cs Co-authored-by: Liudmila Molkova <[email protected]>

xakep139 · 2023-10-18T16:22:08Z

@lmolkova please take a look at my latest changes, I addressed most of the issues after the discussion with @klauco and @noahfalk

lmolkova

The changes look good to me, but I believe we still need to confirm a few things:

do we expect exception summarizer to produce low-cardinality summaries
do we still need the failure reason attribute
what exactly does CPU utilization metric reports and if it needs state attributes (as OTel one)

martintmk · 2023-10-21T07:42:00Z

src/Libraries/Microsoft.Extensions.Resilience/Resilience/Internal/ResilienceTagNames.cs


-    public const string DependencyName = "dep-name";
+    public const string DependencyName = "dotnet.resilience.dependency.name";


Suggested change

public const string DependencyName = "dotnet.resilience.dependency.name";

public const string DependencyName = "dotnet.dependency.name";

The idea behind adding these tags to resilience metrics was that we can correlate resilience events with the http metrics. In that sense the name of this tag should be the same as the tag used to track RequestName and DependencyName for HTTP scenarios.

Do we know how the RequestMetadata.DependencyName and RequestMetadata.RequestName is represented in Otel world?

In the current HttpClient metrics there's no such dimensions: https://learn.microsoft.com/en-us/dotnet/core/diagnostics/built-in-metrics-system-net#instrument-httpclientrequestduration
Neither OTel specifies this: https://github.com/open-telemetry/semantic-conventions/blob/main/docs/http/http-metrics.md#metric-httpclientrequestduration
I agree we need to unify these dimensions/attributes if they will represent same things in HttpClient metering (hopefully we'll add these bits eventually) and resilience libraries.

Yup correct, these are not strictly tied to resilience so it would be better to not include it in the name to avoid doing breaking changes in the future.

Ideally, this would be the same name as for HTTP metrics.

xakep139 · 2023-10-21T09:03:06Z

The changes look good to me, but I believe we still need to confirm a few things:

do we expect exception summarizer to produce low-cardinality summaries

do we still need the failure reason attribute

what exactly does CPU utilization metric reports and if it needs state attributes (as OTel one)

@geeknoid can you please clarify the expected cardinality that comes from exception summarizer?
@martintmk, looking at your comment #4482 (comment), are you saying we can replace dotnet.resilience.failure.source, dotnet.resilience.failure.reason and dotnet.resilience.failure.summary with error.type and dotnet.exception.source? Did I get it right?

Regarding CPU utilization we agreed with folks (Matej, Noah and you) that we don't cover it in that PR.

martintmk · 2023-10-22T19:34:00Z

The changes look good to me, but I believe we still need to confirm a few things:

do we expect exception summarizer to produce low-cardinality summaries

do we still need the failure reason attribute

what exactly does CPU utilization metric reports and if it needs state attributes (as OTel one)

@geeknoid can you please clarify the expected cardinality that comes from exception summarizer? @martintmk, looking at your comment #4482 (comment), are you saying we can replace dotnet.resilience.failure.source, dotnet.resilience.failure.reason and dotnet.resilience.failure.summary with error.type and dotnet.exception.source? Did I get it right?

Correct, this is also based on recommendation by @lmolkova

geeknoid · 2023-10-23T14:27:50Z

@xakep139 Yes, the point of the summarizer is specifically to produce low cardinality values devoid of privacy-sensitive information.

xakep139 · 2023-10-23T14:35:38Z

We agreed with @martintmk that I will apply naming changes he made in #4600 to this PR, specifically we keep these attributes:

request.dependency.name - neither Resilience nor .NET-specific
request.name - neither Resilience nor .NET-specific
error.type

Everything else is removed from Resilience tag names.

lmolkova · 2023-10-23T17:26:14Z

request.dependency.name - neither Resilience nor .NET-specific
request.name - neither Resilience nor .NET-specific

I believe you take request and dependency terms from application Insights, correct?
Request or dependency names in this case are span name and request.dependency.name is an oxymoron (request is a server span and dependency is a client span).

There is no direct translation for span name to a metric tag, I'd say you'd have a metric with the same name as span.

If this is not an option, then consider dotnet.resilience.operation.name or something that would be specific to this library.
If you have a good suggestion for a genric attribute name, let's bring it up to the otel spec.

...aries/Microsoft.Extensions.Diagnostics.ResourceMonitoring/ResourceMonitoringOptions.Linux.cs

…ing/ResourceMonitoringOptions.Linux.cs

davidfowl · 2023-10-31T14:23:43Z

Excellent work!

Aligning metrics with OTel semantic convention

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dotnet/extensions metric names to follow some convention #4432

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Merge branch 'release/8.0' into xakep139/4432-metric-names-convention

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fix the build

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resilience enrichment tags

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again Windows counters

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Update src/Libraries/Microsoft.AspNetCore.HeaderParsing/Metric.cs

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Co-authored-by: Noah Falk <[email protected]>

fixes + improve mutation score

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.NET docs to include metrics emitted by extensions #4522

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CR + fixes

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remove redundant dimension

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Specify description for all instruments #4523

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Drop FailureResultContext #4600

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Leftover references to R9 in repository #4115

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align Resilience attribute names

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		public const string FailureReason = "failure-reason";
		public const string FailureReason = "resilience.failure.reason";


		public const string DependencyName = "dep-name";
		public const string DependencyName = "dotnet.resilience.dependency.name";

Aligning metrics with OTel semantic conventions #4482

Aligning metrics with OTel semantic conventions #4482

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