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/* -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 8 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsISupports.idl"
#include "nsIFile.idl"
[scriptable,function, uuid(3d3b9075-5549-4244-9c08-b64fefa1dd60)]
interface nsIFetchTelemetryDataCallback : nsISupports
{
void complete();
};
[scriptable, uuid(273d2dd0-6c63-475a-b864-cb65160a1909)]
interface nsITelemetry : nsISupports
{
/**
* Histogram types:
* HISTOGRAM_EXPONENTIAL - buckets increase exponentially
* HISTOGRAM_LINEAR - buckets increase linearly
* HISTOGRAM_BOOLEAN - For storing 0/1 values
* HISTOGRAM_FLAG - For storing a single value; its count is always == 1.
* HISTOGRAM_COUNT - For storing counter values without bucketing.
* HISTOGRAM_CATEGORICAL - For storing enumerated values by label.
*/
const unsigned long HISTOGRAM_EXPONENTIAL = 0;
const unsigned long HISTOGRAM_LINEAR = 1;
const unsigned long HISTOGRAM_BOOLEAN = 2;
const unsigned long HISTOGRAM_FLAG = 3;
const unsigned long HISTOGRAM_COUNT = 4;
const unsigned long HISTOGRAM_CATEGORICAL = 5;
/**
* Scalar types:
* SCALAR_TYPE_COUNT - for storing a numeric value
* SCALAR_TYPE_STRING - for storing a string value
* SCALAR_TYPE_BOOLEAN - for storing a boolean value
*/
const unsigned long SCALAR_TYPE_COUNT = 0;
const unsigned long SCALAR_TYPE_STRING = 1;
const unsigned long SCALAR_TYPE_BOOLEAN = 2;
/**
* Dataset types:
* DATASET_ALL_CHANNELS - the basic dataset that is on-by-default on all channels
* DATASET_PRERELEASE_CHANNELS - the extended dataset that is opt-in on release,
* opt-out on pre-release channels.
*/
const unsigned long DATASET_ALL_CHANNELS = 0;
const unsigned long DATASET_PRERELEASE_CHANNELS = 1;
/**
* Serializes the histogram labels for categorical hitograms.
* The returned structure looks like:
* { "histogram1": [ "histogram1_label1", "histogram1_label2", ...],
* "histogram2": [ "histogram2_label1", "histogram2_label2", ...]
* ...
* }
*
* Note that this function should only be used in tests and about:telemetry.
*/
[implicit_jscontext]
jsval getCategoricalLabels();
/**
* Serializes the histograms from the given store to a JSON-style object.
* The returned structure looks like:
* { "process": { "name1": histogramData1, "name2": histogramData2 }, ... }
*
* Each histogram is represented in a packed format and has the following properties:
* bucket_count - Number of buckets of this histogram
* histogram_type - HISTOGRAM_EXPONENTIAL, HISTOGRAM_LINEAR, HISTOGRAM_BOOLEAN,
* HISTOGRAM_FLAG, HISTOGRAM_COUNT, or HISTOGRAM_CATEGORICAL
* sum - sum of the bucket contents
* range - A 2-item array of minimum and maximum bucket size
* values - Map from bucket to the bucket's count
*
* @param aStoreName The name of the store to snapshot.
* Defaults to "main".
* Custom stores are available when probes have them defined.
* See the `record_into_store` attribute on histograms.
* @param aClearStore Whether to clear out the histograms in the named store after snapshotting.
* Defaults to false.
* @param aFilterTest If true, `TELEMETRY_TEST_` histograms will be filtered out.
Filtered histograms are still cleared if `aClearStore` is true.
* Defaults to false.
*/
[implicit_jscontext]
jsval getSnapshotForHistograms([optional] in ACString aStoreName, [optional] in boolean aClearStore, [optional] in boolean aFilterTest);
/**
* Serializes the keyed histograms from the given store to a JSON-style object.
* The returned structure looks like:
* { "process": { "name1": { "key_1": histogramData1, "key_2": histogramData2 }, ...}, ... }
*
* @param aStoreName The name of the store to snapshot.
* Defaults to "main".
* Custom stores are available when probes have them defined.
* See the `record_into_store` attribute on histograms.
* @param aClearStore Whether to clear out the keyed histograms in the named store after snapshotting.
* Defaults to false.
* @param aFilterTest If true, `TELEMETRY_TEST_` histograms will be filtered out.
Filtered histograms are still cleared if `aClearStore` is true.
* Defaults to false.
*/
[implicit_jscontext]
jsval getSnapshotForKeyedHistograms([optional] in ACString aStoreName, [optional] in boolean aClearStore, [optional] in boolean aFilterTest);
/**
* Serializes the scalars from the given store to a JSON-style object.
* The returned structure looks like:
* { "process": { "category1.probe": 1,"category1.other_probe": false, ... }, ... }.
*
* @param aStoreName The name of the store to snapshot.
* Defaults to "main".
* Custom stores are available when probes have them defined.
* See the `record_into_store` attribute on scalars.
* @param aClearStore Whether to clear out the scalars in the named store after snapshotting.
* Defaults to false.
* @param aFilterTest If true, `telemetry.test` scalars will be filtered out.
Filtered scalars are still cleared if `aClearStore` is true.
* Defaults to false.
*/
[implicit_jscontext]
jsval getSnapshotForScalars([optional] in ACString aStoreName, [optional] in boolean aClearStore, [optional] in boolean aFilterTest);
/**
* Serializes the keyed scalars from the given store to a JSON-style object.
* The returned structure looks like:
* { "process": { "category1.probe": { "key_1": 2, "key_2": 1, ... }, ... }, ... }
*
* @param aStoreName The name of the store to snapshot.
* Defaults to "main".
* Custom stores are available when probes have them defined.
* See the `record_into_store` attribute on scalars.
* @param aClearStore Whether to clear out the keyed scalars in the named store after snapshotting.
* Defaults to false.
* @param aFilterTest If true, `telemetry.test` scalars will be filtered out.
Filtered scalars are still cleared if `aClearStore` is true.
* Defaults to false.
*/
[implicit_jscontext]
jsval getSnapshotForKeyedScalars([optional] in ACString aStoreName, [optional] in boolean aClearStore, [optional] in boolean aFilterTest);
/**
* The amount of time, in milliseconds, that the last session took
* to shutdown. Reads as 0 to indicate failure.
*/
readonly attribute uint32_t lastShutdownDuration;
/**
* The number of failed profile lock attempts that have occurred prior to
* successfully locking the profile
*/
readonly attribute uint32_t failedProfileLockCount;
/*
* An object containing information about slow SQL statements.
*
* {
* mainThread: { "sqlString1": [<hit count>, <total time>], "sqlString2": [...], ... },
* otherThreads: { "sqlString3": [<hit count>, <total time>], "sqlString4": [...], ... }
* }
*
* where:
* mainThread: Slow statements that executed on the main thread
* otherThreads: Slow statements that executed on a non-main thread
* sqlString - String of the offending statement (see note)
* hit count - The number of times this statement required longer than the threshold time to execute
* total time - The sum of all execution times above the threshold time for this statement
*
* Note that dynamic SQL strings and SQL strings executed against addon DBs could contain private information.
* This property represents such SQL as aggregate database-level stats and the sqlString contains the database
* filename instead.
*/
[implicit_jscontext]
readonly attribute jsval slowSQL;
/*
* See slowSQL above.
*
* An object containing full strings of every slow SQL statement if toolkit.telemetry.debugSlowSql = true
* The returned SQL strings may contain private information and should not be reported to Telemetry.
*/
[implicit_jscontext]
readonly attribute jsval debugSlowSQL;
/**
* Flags for getUntrustedModuleLoadEvents.
*/
/**
* This flag is set to retrieve all data including instances which have been
* retrieved before. If not set, only new instances since the last call
* will be returned.
* If this flag is set, KEEP_LOADEVENTS_NEW must not be set unless
* EXCLUDE_STACKINFO_FROM_LOADEVENTS is set.
* (See also MultiGetUntrustedModulesData::Serialize.)
*/
const unsigned long INCLUDE_OLD_LOADEVENTS = 1 << 0;
/**
* This flag is set to keep the returned instances as if they were not
* retrieved, meaning those instances will be returned by a next method
* call without INCLUDE_OLD_LOADEVENTS. If not set, the returned instances
* can be re-retrieved only when INCLUDE_OLD_LOADEVENTS is specified.
* If this flag is set, INCLUDE_OLD_LOADEVENTS must not be set unless
* EXCLUDE_STACKINFO_FROM_LOADEVENTS is set.
* (See also MultiGetUntrustedModulesData::Serialize.)
*/
const unsigned long KEEP_LOADEVENTS_NEW = 1 << 1;
/**
* This flag is set to include private fields.
* Do not specify this flag to retrieve data to be submitted.
*/
const unsigned long INCLUDE_PRIVATE_FIELDS_IN_LOADEVENTS = 1 << 2;
/**
* This flag is set to exclude the "combinedStacks" field.
* Without this flag, the flags INCLUDE_OLD_LOADEVENTS and KEEP_LOADEVENTS_NEW
* cannot be set at the same time.
*/
const unsigned long EXCLUDE_STACKINFO_FROM_LOADEVENTS = 1 << 3;
/*
* An array of untrusted module load events. Each element describes one or
* more modules that were loaded, contextual information at the time of the
* event (including stack trace), and flags describing the module's
* trustworthiness.
*
* @param aFlags Combination (bitwise OR) of the flags specified above.
* Defaults to 0.
*/
[implicit_jscontext]
Promise getUntrustedModuleLoadEvents([optional] in unsigned long aFlags);
/*
* Asynchronously get an array of the modules loaded in the process.
*
* The data has the following structure:
*
* [
* {
* "name": <string>, // Name of the module file (e.g. xul.dll)
* "version": <string>, // Version of the module
* "debugName": <string>, // ID of the debug information file
* "debugID": <string>, // Name of the debug information file
* "certSubject": <string>, // Name of the organization that signed the binary (Optional, only defined when present)
* },
* ...
* ]
*
* @return A promise that resolves to an array of modules or rejects with
NS_ERROR_FAILURE on failure.
* @throws NS_ERROR_NOT_IMPLEMENTED if the Gecko profiler is not enabled.
*/
[implicit_jscontext]
Promise getLoadedModules();
/*
* An object with two fields: memoryMap and stacks.
* * memoryMap is a list of loaded libraries.
* * stacks is a list of stacks. Each stack is a list of pairs of the form
* [moduleIndex, offset]. The moduleIndex is an index into the memoryMap and
* offset is an offset in the library at memoryMap[moduleIndex].
* This format is used to make it easier to send the stacks to the
* symbolication server.
*/
[implicit_jscontext]
readonly attribute jsval lateWrites;
/**
* Create and return a histogram registered in TelemetryHistograms.h.
*
* @param id - unique identifier from TelemetryHistograms.h
* The returned object has the following functions:
* add(value) - Adds a sample of `value` to the histogram.
`value` may be a categorical histogram's label as a string,
a boolean histogram's value as a boolean,
or a number that fits inside a uint32_t.
* snapshot([optional] {store}) - Returns a snapshot of the histogram with the same data fields
as in getSnapshotForHistograms().
Defaults to the "main" store.
* clear([optional] {store}) - Zeros out the histogram's buckets and sum.
Defaults to the "main" store.
Note: This is intended to be only used in tests.
*/
[implicit_jscontext]
jsval getHistogramById(in ACString id);
/**
* Create and return a histogram registered in TelemetryHistograms.h.
*
* @param id - unique identifier from TelemetryHistograms.h
* The returned object has the following functions:
* add(string key, [optional] value) - Adds a sample of `value` to the histogram for that key.
If no histogram for that key exists yet, it is created.
`value` may be a categorical histogram's label as a string,
a boolean histogram's value as a boolean,
or a number that fits inside a uint32_t.
* snapshot([optional] {store}) - Returns the snapshots of all the registered keys in the form
{key1: snapshot1, key2: snapshot2, ...} in the specified store.
* Defaults to the "main" store.
* keys([optional] {store}) - Returns an array with the string keys of the currently registered
histograms in the given store.
Defaults to "main".
* clear([optional] {store}) - Clears the registered histograms from this.
* Defaults to the "main" store.
* Note: This is intended to be only used in tests.
*/
[implicit_jscontext]
jsval getKeyedHistogramById(in ACString id);
/**
* A flag indicating if Telemetry can record base data (FHR data). This is true if the
* FHR data reporting service or self-support are enabled.
*
* In the unlikely event that adding a new base probe is needed, please check the data
* collection wiki at https://wiki.mozilla.org/Firefox/Data_Collection and talk to the
* Telemetry team.
*/
attribute boolean canRecordBase;
/**
* A flag indicating if Telemetry is allowed to record extended data. Returns false if
* the user hasn't opted into "extended Telemetry" on the Release channel, when the
* user has explicitly opted out of Telemetry on Nightly/Aurora/Beta or if manually
* set to false during tests.
*
* Set this to false in tests to disable gathering of extended telemetry statistics.
*/
attribute boolean canRecordExtended;
/**
* A flag indicating whether Telemetry is recording release data, which is a
* smallish subset of our usage data that we're prepared to handle from our
* largish release population.
*
* This is true most of the time.
*
* This will always return true in the case of a non-content child process.
* Only values returned on the parent process are valid.
*
* This does not indicate whether Telemetry will send any data. That is
* governed by user preference and other mechanisms.
*
* You may use this to determine if it's okay to record your data.
*/
readonly attribute boolean canRecordReleaseData;
/**
* A flag indicating whether Telemetry is recording prerelease data, which is
* a largish amount of usage data that we're prepared to handle from our
* smallish pre-release population.
*
* This is true on pre-release branches of Firefox.
*
* This does not indicate whether Telemetry will send any data. That is
* governed by user preference and other mechanisms.
*
* You may use this to determine if it's okay to record your data.
*/
readonly attribute boolean canRecordPrereleaseData;
/**
* A flag indicating whether Telemetry can submit official results (for base or extended
* data). This is true on official, non-debug builds with built in support for Mozilla
* Telemetry reporting.
*
* This will always return true in the case of a non-content child process.
* Only values returned on the parent process are valid.
*/
readonly attribute boolean isOfficialTelemetry;
/**
* Enable/disable recording for this histogram at runtime.
* Recording is enabled by default, unless listed at kRecordingInitiallyDisabledIDs[].
* Name must be a valid Histogram identifier, otherwise an assertion will be triggered.
*
* @param id - unique identifier from histograms.json
* @param enabled - whether or not to enable recording from now on.
*/
void setHistogramRecordingEnabled(in ACString id, in boolean enabled);
/**
* Read data from the previous run. After the callback is called, the last
* shutdown time is available in lastShutdownDuration and any late
* writes in lateWrites.
*/
void asyncFetchTelemetryData(in nsIFetchTelemetryDataCallback aCallback);
/**
* Get statistics of file IO reports, null, if not recorded.
*
* The statistics are returned as an object whose propoerties are the names
* of the files that have been accessed and whose corresponding values are
* arrays of size three, representing startup, normal, and shutdown stages.
* Each stage's entry is either null or an array with the layout
* [total_time, #creates, #reads, #writes, #fsyncs, #stats]
*/
[implicit_jscontext]
readonly attribute jsval fileIOReports;
/**
* Return the number of milliseconds since process start using monotonic
* timestamps (unaffected by system clock changes). On Windows, this includes
* the period of time the device was suspended. On Linux and macOS, this does
* not include the period of time the device was suspneded.
*/
double msSinceProcessStart();
/**
* Return the number of milliseconds since process start using monotonic
* timestamps (unaffected by system clock changes), including the periods of
* time the device was suspended.
* @throws NS_ERROR_NOT_AVAILABLE if unavailable.
*/
double msSinceProcessStartIncludingSuspend();
/**
* Return the number of milliseconds since process start using monotonic
* timestamps (unaffected by system clock changes), excluding the periods of
* time the device was suspended.
* @throws NS_ERROR_NOT_AVAILABLE if unavailable.
*/
double msSinceProcessStartExcludingSuspend();
/**
* Time since the system wide epoch. This is not a monotonic timer but
* can be used across process boundaries.
*/
double msSystemNow();
/**
* Adds the value to the given scalar.
*
* @param aName The scalar name.
* @param aValue The numeric value to add to the scalar. Only unsigned integers supported.
*/
[implicit_jscontext]
void scalarAdd(in ACString aName, in jsval aValue);
/**
* Sets the scalar to the given value.
*
* @param aName The scalar name.
* @param aValue The value to set the scalar to. If the type of aValue doesn't match the
* type of the scalar, the function will fail. For scalar string types, the this
* is truncated to 50 characters.
*/
[implicit_jscontext]
void scalarSet(in ACString aName, in jsval aValue);
/**
* Sets the scalar to the maximum of the current and the passed value.
*
* @param aName The scalar name.
* @param aValue The numeric value to set the scalar to. Only unsigned integers supported.
*/
[implicit_jscontext]
void scalarSetMaximum(in ACString aName, in jsval aValue);
/**
* Adds the value to the given keyed scalar.
*
* @param aName The scalar name.
* @param aKey The key name.
* @param aValue The numeric value to add to the scalar. Only unsigned integers supported.
*/
[implicit_jscontext]
void keyedScalarAdd(in ACString aName, in AString aKey, in jsval aValue);
/**
* Sets the keyed scalar to the given value.
*
* @param aName The scalar name.
* @param aKey The key name.
* @param aValue The value to set the scalar to. If the type of aValue doesn't match the
* type of the scalar, the function will fail.
*/
[implicit_jscontext]
void keyedScalarSet(in ACString aName, in AString aKey, in jsval aValue);
/**
* Sets the keyed scalar to the maximum of the current and the passed value.
*
* @param aName The scalar name.
* @param aKey The key name.
* @param aValue The numeric value to set the scalar to. Only unsigned integers supported.
*/
[implicit_jscontext]
void keyedScalarSetMaximum(in ACString aName, in AString aKey, in jsval aValue);
/**
* Resets all the stored scalars. This is intended to be only used in tests.
*/
void clearScalars();
/**
* Immediately sends any Telemetry batched on this process to the parent
* process. This is intended only to be used on process shutdown.
*/
void flushBatchedChildTelemetry();
/**
* Record an event in Telemetry.
*
* @param aCategory The category name.
* @param aMethod The method name.
* @param aObject The object name.
* @param aValue An optional string value to record.
* @param aExtra An optional object of the form (string -> string).
* It should only contain registered extra keys.
*
* @throws NS_ERROR_INVALID_ARG When trying to record an unknown event.
*/
[implicit_jscontext, optional_argc]
void recordEvent(in ACString aCategory, in ACString aMethod, in ACString aObject, [optional] in jsval aValue, [optional] in jsval extra);
/**
* Enable recording of events in a category.
* Events default to recording disabled. This allows to toggle recording for all events
* in the specified category.
*
* @param aCategory The category name.
* @param aEnabled Whether recording is enabled for events in that category.
*/
void setEventRecordingEnabled(in ACString aCategory, in boolean aEnabled);
/**
* Serializes the recorded events to a JSON-appropriate array and optionally resets them.
* The returned structure looks like this:
* [
* // [timestamp, category, method, object, stringValue, extraValues]
* [43245, "category1", "method1", "object1", "string value", null],
* [43258, "category1", "method2", "object1", null, {"key1": "string value"}],
* ...
* ]
*
* @param aDataset DATASET_ALL_CHANNELS or DATASET_PRERELEASE_CHANNELS.
* @param [aClear=false] Whether to clear out the flushed events after snapshotting.
* @param aEventLimit How many events per process to limit the snapshot to contain, all if unspecified.
* Even if aClear, the leftover event records are not cleared.
*/
[implicit_jscontext, optional_argc]
jsval snapshotEvents(in uint32_t aDataset, [optional] in boolean aClear, [optional] in uint32_t aEventLimit);
/**
* Register new events to record them from addons. This allows registering multiple
* events for a category. They will be valid only for the current Firefox session.
* Note that events shipping in Firefox should be registered in Events.yaml.
*
* @param aCategory The unique category the events are registered in.
* @param aEventData An object that contains registration data for 1-N events of the form:
* {
* "categoryName": {
* "methods": ["test1"],
* "objects": ["object1"],
* "record_on_release": false,
* "extra_keys": ["key1", "key2"], // optional
* "expired": false // optional, defaults to false.
* },
* ...
* }
* @param aEventData.<name>.methods List of methods for this event entry.
* @param aEventData.<name>.objects List of objects for this event entry.
* @param aEventData.<name>.extra_keys Optional, list of allowed extra keys for this event entry.
* @param aEventData.<name>.record_on_release Optional, whether to record this data on release.
* Defaults to false.
* @param aEventData.<name>.expired Optional, whether this event entry is expired. This allows
* recording it without error, but it will be discarded. Defaults to false.
*/
[implicit_jscontext]
void registerEvents(in ACString aCategory, in jsval aEventData);
/**
* Parent process only. Register dynamic builtin events. The parameters
* have the same meaning as the usual |registerEvents| function.
*
* This function is only meant to be used to support the "artifact build"/
* "build faster" developers by allowing to add new events without rebuilding
* the C++ components including the headers files.
*/
[implicit_jscontext]
void registerBuiltinEvents(in ACString aCategory, in jsval aEventData);
/**
* Parent process only. Register new scalars to record them from addons. This
* allows registering multiple scalars for a category. They will be valid only for
* the current Firefox session.
* Note that scalars shipping in Firefox should be registered in Scalars.yaml.
*
* @param aCategoryName The unique category the scalars are registered in.
* @param aScalarData An object that contains registration data for multiple scalars in the form:
* {
* "sample_scalar": {
* "kind": Ci.nsITelemetry.SCALAR_TYPE_COUNT,
* "keyed": true, //optional, defaults to false
* "record_on_release: true, // optional, defaults to false
* "expired": false // optional, defaults to false.
* },
* ...
* }
* @param aScalarData.<name>.kind One of the scalar types defined in this file (SCALAR_TYPE_*)
* @param aScalarData.<name>.keyed Optional, whether this is a keyed scalar or not. Defaults to false.
* @param aScalarData.<name>.record_on_release Optional, whether to record this data on release.
* Defaults to false.
* @param aScalarData.<name>.expired Optional, whether this scalar entry is expired. This allows
* recording it without error, but it will be discarded. Defaults to false.
*/
[implicit_jscontext]
void registerScalars(in ACString aCategoryName, in jsval aScalarData);
/**
* Parent process only. Register dynamic builtin scalars. The parameters
* have the same meaning as the usual |registerScalars| function.
*
* This function is only meant to be used to support the "artifact build"/
* "build faster" developers by allowing to add new scalars without rebuilding
* the C++ components including the headers files.
*/
[implicit_jscontext]
void registerBuiltinScalars(in ACString aCategoryName, in jsval aScalarData);
/**
* Resets all the stored events. This is intended to be only used in tests.
* Events recorded but not yet flushed to the parent process storage won't be cleared.
* Override the pref. `toolkit.telemetry.ipcBatchTimeout` to reduce the time to flush events.
*/
void clearEvents();
/**
* Get a list of all registered stores.
*
* The list is deduplicated, but unordered.
*/
[implicit_jscontext]
jsval getAllStores();
/**
* Does early, cheap initialization for native telemetry data providers.
* Currently, this includes only MemoryTelemetry.
*/
void earlyInit();
/**
* Does late, expensive initialization for native telemetry data providers.
* Currently, this includes only MemoryTelemetry.
*
* This should only be called after startup has completed and the event loop
* is idle.
*/
void delayedInit();
/**
* Shuts down native telemetry providers. Currently, this includes only
* MemoryTelemetry.
*/
void shutdown();
/**
* Gathers telemetry data for memory usage and records it to the data store.
* Returns a promise which resolves when asynchronous data collection has
* completed and all data has been recorded.
*/
[implicit_jscontext]
Promise gatherMemory();
/**
* Serializes the per-origin data in plain text, optionally clearing
* the storage. Only to be used by about:telemetry.
*
* The returned structure looks like:
* { metric: {origin1: count1, origin2: count2, ...}, ...}
*
* @param aClear Whether to clear the storage. Default false.
* @return a snapshot of the per-origin data.
*/
[implicit_jscontext]
jsval getOriginSnapshot([optional] in boolean aClear);
/**
* Encodes the per-origin information then serializes it.
* Returns a Promise.
*
* @param aClear Whether to clear the storage. Default false.
* @return Promise that resolves to the serialized encoded data.
*/
[implicit_jscontext]
Promise getEncodedOriginSnapshot([optional] in boolean aClear);
/**
* Clears Firefox Origin Telemetry. Only to be used in tests.
*/
void clearOrigins();
};