Basic Options

SDKs are configurable using a variety of options. The options are largely standardized among SDKs, but there are some differences to better accommodate platform peculiarities. Options are set when the SDK is first initialized.

import io.sentry.kotlin.multiplatform.Sentry

Sentry.init { options ->
  options.dsn = "https://examplePublicKey@o0.ingest.sentry.io/0"
  options.release = "io.sentry.samples@3.0.0+1"
}

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 that can be read from an environment variable (SENTRY_DSN, SENTRY_ENVIRONMENT, SENTRY_RELEASE) are read automatically.

dsn

The DSN tells the SDK where to send the events. 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.

Learn more about DSN utilization.

debug

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. It's generally not recommended to turn it on in production, though turning debug mode on will not cause any safety concerns.

diagnosticLevel

Enabling debug mode makes the SDK generate as much diagnostic data as possible. However, if you'd prefer to lower the verbosity of the Sentry SDK diagnostics logs, configure this option to set the appropriate level:

• debug: default The most verbose mode
• info: Informational messages
• warning: Warning that something might not be right
• error: Only SDK internal errors are printed
• fatal: Only critical errors are printed

dist

Sets the distribution of the application. Distributions are used to disambiguate build or deployment variants of the same release of an application. For example, the dist can be the build number of an Xcode build or the version code of an Android build. The dist has a max length of 64 characters.

release

Sets the release. Some SDKs will try to automatically configure a release out of the box but it's a better idea to manually set it to guarantee that the release is in sync with your deploy integrations or source map uploads. Release names are strings, but some formats are detected by Sentry and might be rendered differently. Learn more about how to send release data so Sentry can tell you about regressions between releases and identify the potential source in the releases documentation or the sandbox.

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.id if available).

environment

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).

sampleRate

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

maxBreadcrumbs

This variable controls the total amount of breadcrumbs that should be captured. This defaults to 100, but you can set this to any number. However, you should be aware that Sentry has a maximum payload size and any events exceeding that payload size will be dropped.

maxCacheItems

The maximum number of envelopes to keep in cache. The SDKs use envelopes to send data, such as events, attachments, user feedback, and sessions to sentry.io. An envelope can contain multiple items, such as an event with a session and two attachments. Depending on the usage of the SDK, the size of an envelope can differ. If the number of envelopes in the local cache exceeds max-cache-items, the SDK deletes the oldest envelope and migrates the sessions to the next envelope to maintain the integrity of your release health stats. The default is 30.

attachStacktrace

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

This option is turned on by default.

Grouping in Sentry is different for events with stack traces and without. As a result, you will get new groups as you enable or disable this flag for certain events.

sendDefaultPii

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

This option is turned off by default.

If you enable this option, be sure to manually remove what you don't want to send using our features for managing Sensitive Data.

serverName

This option 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.

inAppInclude

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

Sentry differentiates stack frames that are directly related to your application ("in application") from stack frames that come from other packages such as the standard library, frameworks, or other dependencies. The application package is automatically marked as inApp. The difference is visible in sentry.io, where only the "in application" frames are displayed by default.

inAppExclude

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

This option can be overridden using inAppInclude.

ignoredExceptionsForType

A list of exception types that will be filtered out before sending to Sentry.

maxRequestBodySize

This parameter controls whether 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. The cutoff for small depends on the SDK (typically 4KB).
• medium: Medium and small requests will be captured (typically 10KB).
• always: The SDK will always capture the request body as long as Sentry can make sense of it.

enabled

Specifies whether this SDK should send events to Sentry. Defaults to true. Setting this to enabled: false doesn't prevent all overhead from Sentry instrumentation. To disable Sentry completely, depending on environment, call Sentry.init conditionally.

sendClientReports

Set this boolean to false to disable sending of client reports. Client reports are a protocol feature that let clients send status reports about themselves to Sentry. They are currently mainly used to emit outcomes for events that were never sent.

(New in version 6.0.0)

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.

integrations

In some SDKs, the integrations are configured through this parameter on library initialization. For more information, please see our documentation for a specific integration.

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

This can be used to disable integrations that are enabled by default if the SDK detects that the corresponding framework or library is installed. When set to false, none of these integrations will be enabled by default, even if the corresponding framework/library is detected.

Hooks

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

beforeSend

This function is called with an SDK-specific message or error event object, and can return a modified event object, or null to skip reporting the event. This can be used, for instance, for manual PII stripping before sending.

By the time beforeSend is executed, all scope data has already been applied to the event. Further modification of the scope won't have any effect.

beforeSendTransaction

This function is called with an SDK-specific transaction event object, and can return a modified transaction event object, or null to skip reporting the event. One way this might be used is for manual PII stripping before sending.

beforeBreadcrumb

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, return the first argument, which contains the breadcrumb object. The callback typically gets a second argument (called a "hint") which contains the original object from which the breadcrumb was created to further customize what the breadcrumb should look like.

Transport Options

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

transport

Switches out the transport 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.

httpProxy

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.

shutdownTimeout

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

Tracing Options

enableTracing

A boolean value, if true, transactions and trace data will be generated and captured. This will set the traces-sample-rate to the recommended default of 1.0 if traces-sample-rate is not defined. Note that traces-sample-rate and traces-sampler take precedence over this option.

tracesSampleRate

A number between 0 and 1, controlling the percentage chance a given transaction will be sent to Sentry. (0 represents 0% while 1 represents 100%.) Applies equally to all transactions created in the app. Either this or tracesSampler must be defined to enable tracing.

tracesSampler

A function responsible for determining the percentage chance a given transaction will be sent to Sentry. It will automatically be passed information about the transaction and the context in which it's being created, and must return a number between 0 (0% chance of being sent) and 1 (100% chance of being sent). Can also be used for filtering transactions, by returning 0 for those that are unwanted. Either this or tracesSampleRate must be defined to enable tracing.

tracingOrigins

An optional property that configures which downstream services receive the sentry-trace header attached to HTTP requests. It contains a list of URLs or regex against which URLs are matched. If not set, the sentry-trace header is attached to every request executed from an instrumented client.

tracePropagationTargets

An optional property that controls which downstream services receive tracing data, in the form of a sentry-trace and a baggage header attached to any outgoing HTTP requests.

The option may contain a list of strings or regex against which the URLs of outgoing requests are matched. If one of the entries in the list matches the URL of an outgoing request, trace data will be attached to that request. String entries do not have to be full matches, meaning the URL of a request is matched when it contains a string provided through the option.

If tracePropagationTargets is not provided, trace data is attached to every outgoing request from the instrumented client.

traceOptionsRequests

Set this boolean to false to disable tracing for OPTIONS requests. This options default value will likely be changed in the next major version, meaning you will have to set it to true if you want to keep tracing OPTIONS requests.