Bump the nats group with 1 update

[dependabot]

Updated NATS.Net from 2.7.1 to 2.7.2.

Release notes

Sourced from NATS.Net's releases.

2.7.2

Excited to announce a new patch release of NATS .NET client library version 2.7.2 with an important fix to slow consumers improving reliability and performance.

Please see Preview 1 release notes for details.

Additionally added SlowConsumerDetected event and logging to make sure applications will be aware of he slow consumers and can look into adjusting channel size or application logic to handle slow message processors when identified.

We also have lots of other minor and important fixes and improvements. Please see the full list below.

What's Changed

Preview 1:

• Add API Compat for TFMs by @​mtmk in Add API Compat for TFMs nats-io/nats.net#1033
• Fix slow consumer blocking by @​mtmk in Fix slow consumer blocking nats-io/nats.net#1041
• resolves: 1035 - Use ConnectTimeout when awaiting INFO signal by @​ptsteward in resolves: 1035 - Use ConnectTimeout when awaiting INFO signal nats-io/nats.net#1039

Preview 2:

• FIXED unobserved exceptions surfacing due to unobserved tcs. by @​me064 in FIXED unobserved exceptions surfacing due to unobserved tcs. nats-io/nats.net#1051
• Add SlowConsumerDetected event and warnings by @​mtmk in Add SlowConsumerDetected event and warnings nats-io/nats.net#1052
• Fix subject encoding to use UTF-8 per NATS protocol spec by @​aafloy in Fix subject encoding to use UTF-8 per NATS protocol spec nats-io/nats.net#1054
• Fix OTel activity leak in Direct request mode by @​aradalvand in Fix OTel activity leak in Direct request mode nats-io/nats.net#1047

In this release:

• Fix NatsUri not reflecting host/port changes from OnConnectingAsync hook by @​tormoder in Fix NatsUri not reflecting host/port changes from OnConnectingAsync hook nats-io/nats.net#997
• Fix StreamSourceInfo.Active handle -1 correctly by @​paagamelo2 in Fix StreamSourceInfo.Active handle -1 correctly nats-io/nats.net#1058

New Contributors

• @​ptsteward made their first contribution in resolves: 1035 - Use ConnectTimeout when awaiting INFO signal nats-io/nats.net#1039
• @​me064 made their first contribution in FIXED unobserved exceptions surfacing due to unobserved tcs. nats-io/nats.net#1051
• @​tormoder made their first contribution in Fix NatsUri not reflecting host/port changes from OnConnectingAsync hook nats-io/nats.net#997

Full Changelog: nats-io/nats.net@v2.7.1...v2.7.2

Huge thank you to our community for helping with this release ❤️

Download from NuGet https://www.nuget.org/packages/NATS.Net/2.7.2

2.7.2-preview.2

This is another bug fix preview release possibly last before a stable 2.7.2 release. Please test this release as much as you can and provide feedback. Thank you.

What's Changed

• FIXED unobserved exceptions surfacing due to unobserved tcs. by @​me064 in FIXED unobserved exceptions surfacing due to unobserved tcs. nats-io/nats.net#1051
• Add SlowConsumerDetected event and warnings by @​mtmk in Add SlowConsumerDetected event and warnings nats-io/nats.net#1052
• Fix subject encoding to use UTF-8 per NATS protocol spec by @​aafloy in Fix subject encoding to use UTF-8 per NATS protocol spec nats-io/nats.net#1054
• Fix OTel activity leak in Direct request mode by @​aradalvand in Fix OTel activity leak in Direct request mode nats-io/nats.net#1047

New Contributors

• @​me064 made their first contribution in FIXED unobserved exceptions surfacing due to unobserved tcs. nats-io/nats.net#1051
• @​aafloy made their first contribution in Fix subject encoding to use UTF-8 per NATS protocol spec nats-io/nats.net#1054

Full Changelog: nats-io/nats.net@v2.7.2-preview.1...v2.7.2-preview.2

Huge thanks to our contributors and the awesome NATS community ❤️

Download from NuGet at https://www.nuget.org/packages/NATS.Net/2.7.2-preview.2

2.7.2-preview.1

This is a preview release of NATS .NET version 2.7.2 fixing an important slow consumer issue as well as timeout option correction.

What's Changed

• Fix slow consumer blocking by @​mtmk in Fix slow consumer blocking nats-io/nats.net#1041
• resolves: 1035 - Use ConnectTimeout when awaiting INFO signal by @​ptsteward in resolves: 1035 - Use ConnectTimeout when awaiting INFO signal nats-io/nats.net#1039

Slow Consumer Fix

Although we are happy that we believe slow consumer fix will solve a lot of the performance issues under load, please test this release as much as you can since there maybe behavioral changes that might affect your application. Please see #​1041 for more information.

Here are suggested changes after upgrading to 2.7.2-preview.1 or above:

Observing Slow Consumer Events

In NATS .NET you can watch for slow consumer events by subscribing to MessageDropped event on the INatsConnection object and set the internal channel capacity using the SubPendingChannelCapacity option:

await using var client = new NatsClient(
    opts : new NatsOpts
    {
        // Default is 1024, however, this may be too small for
        // high throughput scenarios. 16K is more reasonable for these cases.
        // Tradeoff is more memory usage especially because over 1024 messages
        // the backing array will be allocated on the LOH (large object heap).
        SubPendingChannelCapacity = 16384,
    },

    // This option may be deprecated in the future and set to DropNewest by default
    pending: BoundedChannelFullMode.DropNewest); 

client.Connection.MessageDropped += (sender, args) =>
{
    Console.WriteLine($"Message dropped. Subject:{args.Subject} Pending:{args.Pending}");
    return default;
};

Trade-offs of SubPendingChannelCapacity

Setting	Pros	Cons
Lower capacity (1024)	Avoids LOH allocations	Higher chance of message drops under load
Higher capacity (16384)	Handles burst traffic better	More memory usage, potential LOH allocations

You should watch LOH memory usage and slow consumer events using MessageDropped handler.

Also note that channel doesn't allocate this immediately. The backing array grows twice as much each time there is need for more space.

Differences between NatsClient and NatsConnection

NatsClient sets SubPendingChannelFullMode option to BoundedChannelFullMode.Wait by default which means you won't take advantage of this fix if you're using NatsClient to setup your connection.

If you are using NatsClient this fix won't affect your applications.
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