SDKs are configurable in many ways. The options are largely standardized between SDKs but there are some differences to better accommodate platform peculiarities. Options are set when the SDK is first initialized.

Options can be set by passing a callback to the UseSentry() method which will pass the option object along for modifications:

ASP.NET Core 2.x:

public static IWebHost BuildWebHost(string[] args) =>
        // Add the following line:
        .UseSentry(o =>
            o.Dsn = "___PUBLIC_DSN___";
            o.MaxBreadcrumbs = 50;
            o.Debug = true;

ASP.NET Core 3.0:

public static IHostBuilder CreateHostBuilder(string[] args) =>
        .ConfigureWebHostDefaults(webBuilder =>
            // Add the following line:
            webBuilder.UseSentry(o =>
                o.Dsn = "___PUBLIC_DSN___";
                o.MaxBreadcrumbs = 50;
                o.Debug = true;

Options are passed to the init() as object:

  dsn: '___PUBLIC_DSN___',
  maxBreadcrumbs: 50,
  debug: true,

Options can be set by passing a callback to the Init() method which will pass the option object along for modifications:

using Sentry;

using (SentrySdk.Init(o =>
    o.Dsn = "___PUBLIC_DSN___";
    o.MaxBreadcrumbs = 50;
    o.Debug = true;
    // app code here

Options are passed to the Init() method as an instance of sentry.ClientOptions:

	Dsn: "___PUBLIC_DSN___",
	Debug: true,

Options are passed to the init() as object:

  dsn: '___PUBLIC_DSN___',
  maxBreadcrumbs: 50,
  debug: true,

Options are passed into sentry_init as a pointer to an options object created via sentry_options_new(). There are functions that allow to set all options individually.

#include <sentry.h>

int main(void) {
  sentry_options_t *options = sentry_options_new();
  sentry_options_set_dsn(options, "___PUBLIC_DSN___");
  sentry_options_set_debug(options, 1);

  /* ... */

Options are passed to the init() method as an array:

  'dsn' => '___PUBLIC_DSN___',
  'max_breadcrumbs' => 50,

Options are passed to the init() function as optional keyword arguments:

import sentry_sdk


Options are passed to the init() as tuple where the first argument is the DSN and the second the options:

sentry::init(("___PUBLIC_DSN___", sentry::ClientOptions {
    max_breadcrumbs: 50,
    debug: true,

Common Options

The list of common options across SDKs. These work more or less the same in all SDKs, but some subtle differences will exist to better support the platform. Options which can be read from an environment variable or your ~/.sentryclirc file (SENTRY_DSN, SENTRY_ENVIRONMENT, SENTRY_RELEASE) are read automatically. See Working with Projects for more information.


The DSN tells the SDK where to send the events to. If this value is not provided, the SDK will try to read it from the SENTRY_DSN environment variable. If that variable also does not exist, the SDK will just not send any events.

In runtimes without a process environment (such as the browser) that fallback does not apply.


Turns debug mode on or off. If debug is enabled SDK will attempt to print out useful debugging information if something goes wrong with sending the event. The default is always false and it’s generally not recommended to turn it on in production but doing so will not cause any safety concerns.


Sets the release. Some SDKs will try to automatically configure a release out of the box but if you have the chance it’s a better idea to manually set it. That way it’s guaranteed to be in sync with your deploy integrations or source map uploads.

Release names are just strings but some formats are detected by Sentry and might be rendered differently. For more information have a look at the releases documentation.

By default the SDK will try to read this value from the SENTRY_RELEASE environment variable (in the browser SDK, this will be read off of the window.SENTRY_RELEASE if available).


Sets the environment. This string is freeform and not set by default. A release can be associated with more than one environment to separate them in the UI (think staging vs prod or similar).

By default the SDK will try to read this value from the SENTRY_ENVIRONMENT environment variable (except for the browser SDK where this is not applicable).


Sets which errors are reported. It takes the same values as PHP’s error_reporting configuration parameter.

By default all types of errors are be reported (equivalent to E_ALL).


Configures the sample rate as a percentage of events to be sent in the range of 0.0 to 1.0. The default is 1.0 which means that 100% of events are sent. If set to 0.1 only 10% of events will be sent. Events are picked randomly.


This variable controls the total amount of breadcrumbs that should be captured. This defaults to 100.


When enabled, stack traces are automatically attached to all messages logged. Stack traces are always attached to exceptions but when this is set stack traces are also sent with messages. This, for instance, means that stack traces appear next to all log messages.

It’s important to note that grouping in Sentry is different for events with stack traces and without. This means that you will get new groups as you enable or disable this flag for certain events.

This feature is off by default.


If this flag is enabled, certain personally identifiable information is added by active integrations. By default no such data is sent.

If possible, it’s recommended to turn on this feature to send all such data by default, and manually remove what you don’t want to send using our features for managing Sensitive Data.


Can be used to supply a “server name.” When provided, the name of the server is sent along and persisted in the event. For many integrations the server name actually corresponds to the device hostname even in situations where the machine is not actually a server. Most SDKs will attempt to auto-discover this value.


A list of strings or regex patterns that match error URLs which should not be sent to Sentry. By default, all errors will be sent.


A legacy alias for a list of strings or regex patterns that match error URLs which should exclusively be sent to Sentry. By default, all errors will be sent.


A list of string prefixes of module names that belong to the app. This option takes precedence over in_app_exclude.


A list of string prefixes of module names that do not belong to the app, but rather third-party packages. Modules considered not to be part of the app will be hidden from stack traces by default.

This option can be overridden using in-app-include.


This parameter controls if integrations should capture HTTP request bodies. It can be set to one of the following values:

  • never: request bodies are never sent.
  • small: only small request bodies will be captured where the cutoff for small depends on the SDK (typically 4KB)
  • medium: medium-sized requests and small requests will be captured. (typically 10KB)
  • always: the SDK will always capture the request body for as long as sentry can make sense of it


When enabled local variables are sent along with stackframes. This can have a performance and PII impact. Enabled by default on platforms where this is available.


A path to an alternative CA bundle file in PEM-format.

Integration Configuration

For many platform SDKs integrations can be configured alongside it. On some platforms that happen as part of the init() call, in some others, different patterns apply.


In some SDKs, the integrations are configured through this parameter on library initialization. For more information, have a look at the specific integration documentation.


This can be used to disable integrations that are added by default. When set to false no default integrations are added.


These options can be used to hook the SDK in various ways to customize the reporting of events.


This function is called with an SDK specific event object and can return a modified event object or nothing to skip reporting the event. This can be used for instance for manual PII stripping before sending.


This function is called with an SDK specific breadcrumb object before the breadcrumb is added to the scope. When nothing is returned from the function, the breadcrumb is dropped. To pass the breadcrumb through, simply return the first argument, which contains the breadcrumb object. The callback typically gets a second argument (called a “hint”) which contains the original object that the breadcrumb was created from to further customize what the breadcrumb should look like.

Transport Options

Transports are used to send events to Sentry. This can be customized to some degree to better support highly specific deployments.


This switches out the transport that is used to send events. How this works depends on the SDK. It can, for instance, be used to capture events for unit-testing or to send it through some more complex setup that requires proxy authentication.


When set, a proxy can be configured that should be used for outbound requests. This is also used for HTTPS requests unless a separate https-proxy is configured. However, not all SDKs support a separate HTTPS proxy. SDKs will attempt to default to the system-wide configured proxy if possible. For instance, on Unix systems, the http_proxy environment variable will be picked up.


Configures a separate proxy for outgoing HTTPS requests. This value might not be supported by all SDKs. When not supported the http-proxy value is also used for HTTPS requests at all times.


Controls how many seconds to wait before shutting down. Sentry SDKs send events from a background queue and this queue is given a certain amount to drain pending events. The default is SDK specific but typically around 2 seconds. Setting this value too low will most likely cause problems for sending events from command line applications. Setting it too high will cause the application to block for a long time for users with network connectivity problems.