Exceptions not showing in Issues when Transactions are rate limited

[MichaelLHerman]

Package

Sentry

.NET Flavor

.NET

.NET Version

9.0.100

OS

iOS

SDK Version

5.1.0

Self-Hosted Sentry Version

No response

Steps to Reproduce

Connect to sentry using an api key that has exceeded its transaction limit

Log an exception

            try
            {
                throw new InvalidOperationException("whoops2");
            }
            catch (Exception ex)
            {
                Sentry.SentrySdk.CaptureException(ex);
            }

Expected Result

Errors should still show in Sentry since they have a different limit

Actual Result

Nothing shows up in Sentry. I think this was working when I had GlobalMode off. Either that or it was working in 4.10.1?
I had removed this because I thought recent changes in v5 had fixed my issues with global mode

        builder.Services.PostConfigure((SentryMauiOptions options) =>
        {
            //need to manually set here because it's overridden by Configure
            options.IsGlobalModeEnabled = false;
        });

Completely fed up with this because the Issues list doesn't show error immediately
https://sentry.io/issues/?environment=RC&environment=debug&query=&referrer=issue-list&statsPeriod=24h&stream_index=0

Need to change the time range to a different value and then back for issues to show up.
Having a horrible experience here, going to look for another alternative to Sentry.

Logs:

Debug: No cached file to process.
Info: Capturing event.
Debug: Running processor on exception: whoops2
Debug: Creating SentryStackTrace. isCurrentStackTrace: False.
Debug: Got debug image for 'CadabraMobile.dll' having Debug ID: 821145f8-9b14-4606-a3ec-94d56ac86bf0-e6b42420
Debug: Created DebugStackTrace with 1 frames.
Debug: Running main event processor on: Event c60318be8549418a97d97c2acb630480
Debug: Merging 1 debug images from stacktrace.
Debug: Event not sampled.
Debug: Enqueuing envelope c60318be8549418a97d97c2acb630480
Info: Envelope queued up: 'c60318be8549418a97d97c2acb630480'
Debug: Storing file /Users/mikeherman/Library/Developer/CoreSimulator/Devices/E1B7745A-F47B-468C-9098-652D17586098/data/Containers/Data/Application/7B9C33F7-B673-4EC6-A95C-8C7A7CC52FB1/Library/Caches/Sentry/FF490A2D9A738DBC0B39B47D3C5F1CCCE05E6897/1738961529_1003_c60318be8549418a97d97c2acb630480_297114243.envelope.
Debug: Attempting to finish Transaction deb481e67b6d6029.
Debug: Finished Transaction deb481e67b6d6029.
Info: Capturing transaction.
Debug: Envelope handed off to transport (event ID: 'c60318be8549418a97d97c2acb630480'). 1 items in queue.
Debug: Enqueuing envelope 300e01729c044352836be11ca7706a95
Info: Envelope queued up: '300e01729c044352836be11ca7706a95'
Debug: CachingTransport worker signal triggered.
Debug: De-queueing event c60318be8549418a97d97c2acb630480
Debug: Flushing cached envelopes.
Debug: Storing file /Users/mikeherman/Library/Developer/CoreSimulator/Devices/E1B7745A-F47B-468C-9098-652D17586098/data/Containers/Data/Application/7B9C33F7-B673-4EC6-A95C-8C7A7CC52FB1/Library/Caches/Sentry/FF490A2D9A738DBC0B39B47D3C5F1CCCE05E6897/1738961529_-6814_300e01729c044352836be11ca7706a95_1270322123.envelope.
Debug: Envelope handed off to transport (event ID: '300e01729c044352836be11ca7706a95'). 1 items in queue.
Debug: Reading cached envelope: /Users/mikeherman/Library/Developer/CoreSimulator/Devices/E1B7745A-F47B-468C-9098-652D17586098/data/Containers/Data/Application/7B9C33F7-B673-4EC6-A95C-8C7A7CC52FB1/Library/Caches/Sentry/FF490A2D9A738DBC0B39B47D3C5F1CCCE05E6897/__processing/1738961529_1003_c60318be8549418a97d97c2acb630480_297114243.envelope
Debug: De-queueing event 300e01729c044352836be11ca7706a95
Debug: Sending cached envelope: c60318be8549418a97d97c2acb630480
Error: HttpTransport: Sentry rejected the envelope 'c60318be8549418a97d97c2acb630480'. Status code: TooManyRequests. Error detail: .
Debug: HttpTransport: Failed envelope 'c60318be8549418a97d97c2acb630480' has payload: {"sdk":{"name":"sentry.dotnet","version":"5.1.0"},"event_id":"c60318be8549418a97d97c2acb630480","trace":{"trace_id":"588be66ffed64b32b021a6f467c5f23c","public_key":"e4c492770536f8d570f2562a10f6113e","sampled":"true","sample_rate":"1","release":"com.acumenmd.cadabra.local@0.0.0\u002B0","environment":"debug","transaction":"HomeViewModel.GoToHelp"},"sent_at":"2025-02-07T20:52:09.748376+00:00"} {"type":"event","length":24539} 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is an invalid value for CornerRadius","category":"Microsoft.Maui.Controls.BindableObject","level":"warning"},{"timestamp":"2025-02-07T20:51:59.123Z","message":"Value is an invalid value for CornerRadius","category":"Microsoft.Maui.Controls.BindableObject","level":"warning"},{"timestamp":"2025-02-07T20:51:59.195Z","message":"Value is an invalid value for CornerRadius","category":"Microsoft.Maui.Controls.BindableObject","level":"warning"},{"timestamp":"2025-02-07T20:51:59.267Z","message":"Value is an invalid value for CornerRadius","category":"Microsoft.Maui.Controls.BindableObject","level":"warning"},{"timestamp":"2025-02-07T20:51:59.340Z","message":"Value is an invalid value for CornerRadius","category":"Microsoft.Maui.Controls.BindableObject","level":"warning"},{"timestamp":"2025-02-07T20:51:59.451Z","type":"http","data":{"url":"https://rounder-api.acumenmd.com/api/provider","method":"GET","status_code":"200"},"category":"http"},{"timestamp":"2025-02-07T20:51:59.519Z","message":"Value 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{"type":"session","length":309} {"sid":"1b754786d54242f39f5147eaca8a2313","did":"e3124e8c-758a-4cf7-bb63-4012b72f8fd4","init":false,"started":"2025-02-07T15:51:28.336679-05:00","timestamp":"2025-02-07T20:52:09.696943+00:00","seq":1,"duration":41,"errors":1,"attrs":{"release":"com.acumenmd.cadabra.local@0.0.0\u002B0","environment":"debug"}}
Debug: Reading cached envelope: /Users/mikeherman/Library/Developer/CoreSimulator/Devices/E1B7745A-F47B-468C-9098-652D17586098/data/Containers/Data/Application/7B9C33F7-B673-4EC6-A95C-8C7A7CC52FB1/Library/Caches/Sentry/FF490A2D9A738DBC0B39B47D3C5F1CCCE05E6897/_processing/1738961529-6814_300e01729c044352836be11ca7706a95_1270322123.envelope
Debug: Sending cached envelope: 300e01729c044352836be11ca7706a95
Debug: HttpTransport: Envelope item of type transaction was discarded because it's rate-limited.
Debug: HttpTransport: Attached client report to envelope 300e01729c044352836be11ca7706a95.
Error: HttpTransport: Sentry rejected the envelope '300e01729c044352836be11ca7706a95'. Status code: TooManyRequests. Error detail: .
Debug: HttpTransport: Failed envelope '300e01729c044352836be11ca7706a95' has payload: {"sdk":{"name":"sentry.dotnet","version":"5.1.0"},"event_id":"300e01729c044352836be11ca7706a95","trace":{"trace_id":"588be66ffed64b32b021a6f467c5f23c","public_key":"e4c492770536f8d570f2562a10f6113e","sampled":"true","sample_rate":"1","release":"com.acumenmd.cadabra.local@0.0.0\u002B0","environment":"debug","transaction":"HomeViewModel.GoToHelp"},"sent_at":"2025-02-07T20:52:09.800028+00:00"} {"type":"client_report","length":200} {"timestamp":"2025-02-07T20:52:09.799254+00:00","discarded_events":[{"reason":"ratelimit_backoff","category":"span","quantity":1},{"reason":"ratelimit_backoff","category":"transaction","quantity":1}]}
Debug: No cached file to process.

[jamescrosswell]

@MichaelLHerman this won't be related to IsGlobalModeEnabled. That should be set to disabled for server applications (like ASP.NET Core applications) and enabled for client applications (like MAUI or WinForms). See the docs.

It looks like the error you're getting is a 429 TooManyRequests... Sentry emits a 429 status code and specifies a Retry-After header. Events collected after receiving the 429 and before the time indicated by the Retry-After header get dropped, to avoid overwhelming the servers.

In addition to Retry-After, Sentry (Relay) also includes a special response header X-Sentry-Rate-Limits containing a detailed list of all rate limits that apply per data category. If no specific category is included in the header then this limit applies to all categories.

In your case I can see this in your logs:

Error: HttpTransport: Sentry rejected the envelope '300e01729c044352836be11ca7706a95'. Status code: TooManyRequests. Error detail: .
Debug: HttpTransport: Failed envelope '300e01729c044352836be11ca7706a95' has payload: {"sdk":{"name":"sentry.dotnet","version":"5.1.0"},"event_id":"300e01729c044352836be11ca7706a95","trace":{"trace_id":"588be66ffed64b32b021a6f467c5f23c","public_key":"e4c492770536f8d570f2562a10f6113e","sampled":"true","sample_rate":"1","release":"com.acumenmd.cadabra.local@0.0.0\u002B0","environment":"debug","transaction":"HomeViewModel.GoToHelp"},"sent_at":"2025-02-07T20:52:09.800028+00:00"} {"type":"client_report","length":200} {"timestamp":"2025-02-07T20:52:09.799254+00:00","discarded_events":[{"reason":"ratelimit_backoff","category":"span","quantity":1},{"reason":"ratelimit_backoff","category":"transaction","quantity":1}]}
Debug: No cached file to process.

There is no category for client reports, since there's no limit to the number of client reports that can be sent.

So in your case, I think your application has simply sent too many messages to Sentry in a short space of time. The server is overwhelmed and protecting itself, so it's telling our SDK to stop sending envelopes (of any kind - including error reports and even client reports).

This isn't a bug... it's a resilience feature to protect Sentry's ingestion servers...

[MichaelLHerman]

Since the sdk is in charge of making requests (it’s not something I can even do myself), from my perspective this is a bug since we are losing data. Why am I getting these 429s in the first place? Shouldn’t the client suspend retrying until after the server tells it to? I saw that it kept on retrying.

Maybe debug logging should be outputting those header values for you to better troubleshoot.

[jamescrosswell]

Hi @MichaelLHerman,

Since the sdk is in charge of making requests (it’s not something I can even do myself), from my perspective this is a bug since we are losing data.

The error reflects the fact that the server has received too many requests. That's a function of how many application instances are sending data and how frequently. About the only thing the SDK could do is try to throttle traffic to the server, but that would be only a stop gap measure. Ultimately, if too many requests are being made to the server, requests have to be discarded.

The alternative would be to cache/stockpile envelopes and then once the server was accepting requests again, try to send the backlog of envelopes... which would overload the server almost instantly and set off a vicious cycle that basically brings the server down permanently.

One thing you could do is tweak the transaction sample rate... and we do have an item on the backlog to do something like that automatically for you:

• Backpressure Management #2410

Shouldn’t the client suspend retrying until after the server tells it to? I saw that it kept on retrying.

It should just drops the envelopes for a 429:

sentry-dotnet/src/Sentry/Http/HttpTransportBase.cs

Lines 97 to 110 in 7da3cf3

	// Check if there is at least one matching category for this item that is rate-limited
	var isRateLimited = CategoryLimitResets
	.Any(kvp => kvp.Value > now && kvp.Key.Matches(item));
	if (isRateLimited)
	{
	var reason = DiscardReason.RateLimitBackoff;
	_options.ClientReportRecorder.RecordDiscardedEvent(reason, item.DataCategory);
	_options.LogDebug(
	"{0}: Envelope item of type {1} was discarded because it's rate-limited.",
	_typeName,
	item.TryGetType());

For other network error types (e.g. network unavailable) it will retry but for a 429 error the intended behaviour is to drop envelopes until the server has capacity to process them again.

Maybe debug logging should be outputting those header values for you to better troubleshoot.

That is certainly a good idea!

• Log rate limit headers #3950

[MichaelLHerman]

@jamescrosswell

Looks like the 429s are from the transaction quota being exceeded. The first 429 has this additional error detail.

2025-02-09 22:38:02.204874-0500 CadabraMobile[75310:4330522] Error: HttpTransport: Sentry rejected the envelope '1162b5a00364485fb653920d63faef83'. Status code: TooManyRequests. Error detail: Sentry dropped data due to a quota or internal rate limit being reached. This will not affect your application. See https://docs.sentry.io/product/accounts/quotas/ for more information.. Error causes: .

I had the app throw both handled (through Sentry.SentrySdk.CaptureException) and unhandled .net exception.
I do see the app sending crash reports before the 429, but I don't see the crash report showing up on Sentry

Full log attached

I'll try this on device instead of debugger tomorrow

sentry 429.txt.zip