Abstract: Disclosed techniques relate to instrumenting applications. In an example, a method instantiates a tracer application based on a start of the web page application. The method automatically logs a start of a first span and executes first operations associated with the first span. The method automatically logs an end of the first span based upon a completion of the first operations. The method automatically logs a start of a second span based on an event initiated by an interaction with the web page application. The method detects, via the tracer application, that a period of inactivity of the web browser occurred and the second span was active before the period of inactivity. The method associates the second span with the period of inactivity based on the detecting. The method automatically logs an end of the second span.

Abstract: Disclosed techniques relate to instrumenting applications. In an example, a method involves providing a web page application with a tracer application. The method further involves accessing a source of the web page application. The method further involves detecting a reference to an element of the web page application in the source. The method further involves detecting the user interaction with the web page application. The method further involves automatically logging a start of a span based on the detection of the user interaction. The logging includes associating the span with the tracer application. The method further involves executing operations relating to the element. The method further involves determining that the element is ready for additional user interactions. The method further involves automatically logging an end of the span based upon the determining.

Abstract: Disclosed techniques relate to error detection and debugging. In an example, a method involves providing, to a client device, an instrumented web page application that includes a tracer. The method further involves receiving a tracing log including a hierarchy of spans associated with execution of the web page application. Each span represents an execution of operations associated with an event and has an associated timestamp. The method further involves identifying, from the hierarchy of spans, one or more spans. The one or more spans are associated with a respective interaction by the user with the web page application. The method further involves deriving a sequence of events, by extracting, for each identified span and the associated timestamp, a respective event. The method further involves executing the sequence of events within an additional instance of the web page application on a developer device.

Abstract: Disclosed techniques relate to curing defects in software. In an example, a method involves receiving, from a first and second tracer, a first and second tracing log respectively. The first and second tracing log include log tracing data represented by a plurality of spans of respective instances of a web page application. The plurality of spans are associated with corresponding events of the respective instances of the web page application. The method further involves generating a first logical tree from the first tracing log and a second logical tree from the second tracing log. The logical trees include a respective plurality of nodes to represent chronological order of events within respective instances of the web page application and an additional node outside of the chronological order. The method further involves identifying correspondences and differences between nodes of the logical trees and generating a report on the set of spans.

Abstract: Disclosed systems relate to automatically instrumenting a web application for tracing. In an example, a method includes providing a web page application to a web browser on a client device. The web page application includes a tracer application. The method further includes detecting a start of the web page application and instantiating tracer application. The tracer application is configured to log tracing data for the web page application. The method further includes detecting an event initiated by interaction with the web page application. The method further includes automatically logging a start of a span based on the detection, the logging associating the span with the tracer application. The method further includes executing operations corresponding to the event. The method further includes automatically logging an end of the span based upon a completion of the operations corresponding to the event.

Abstract: Disclosed techniques relate to tracing a subsidiary thread of a web page application. In an example, a method includes providing a web page application to a web browser. The method further includes creating, from the web page application, a global tracer configured to log tracing data for the web page application and a span. The method further includes instantiating, from the web page application, a wrapper for a subsidiary thread. The wrapper is configured to execute shim code before executing the subsidiary thread. The method further includes passing, from the wrapper to the shim code, configuration data of the global tracer. The method further includes creating a subsidiary tracer from the shim code and the configuration data. The subsidiary tracer configured to log tracing data for the subsidiary thread and a thread span.

Abstract: Disclosed systems relate to propagating tracing across a distributed software application. In an example, an application logs tracing data for a web page from an original server. The application determines, at the web browser, that the web page from the original server requires a request to an external server outside a domain of the original server. The application interrogates the external server to determine whether the external server allows tracing headers in requests. The application updates an allow list, at the web browser, to indicate that the external server allows tracing headers in requests from the original server. The application injects a tracing header in the request based on a result of the interrogation. The application sends, from the web browser to the external server, the request with the tracing header. The external server is configured to log tracing data based on the tracing header.

Abstract: Disclosed systems relate to propagating tracing across a distributed software application. In an example, an application logs tracing data for a web page from an original server. The application determines, at the web browser, that the web page from the original server requires a request to an external server outside a domain of the original server. The application interrogates the external server to determine whether the external server allows tracing headers in requests. The application updates an allow list, at the web browser, to indicate that the external server allows tracing headers in requests from the original server. The application injects a tracing header in the request based on a result of the interrogation. The application sends, from the web browser to the external server, the request with the tracing header. The external server is configured to log tracing data based on the tracing header.

Abstract: Disclosed systems relate to automatically instrumenting a web application for tracing. In an example, a method includes providing a web page application to a web browser on a client device. The web page application includes a tracer application. The method further includes detecting a start of the web page application and instantiating tracer application. The tracer application is configured to log tracing data for the web page application. The method further includes detecting an event initiated by interaction with the web page application. The method further includes automatically logging a start of a span based on the detection, the logging associating the span with the tracer application. The method further includes executing operations corresponding to the event. The method further includes automatically logging an end of the span based upon a completion of the operations corresponding to the event.

Abstract: Disclosed techniques relate to automatically instrumenting a web application. In an aspect, a method identifies that a web application includes an event that is triggered by a user interaction. The method associates the event with a tracer that is configured to log tracing information based on an execution of a first set of operations caused by the event and to obtain a first measurement of performance of a first span. The method identifies, in the code, that the execution of a first set of operations causes a request to be made to a server. The method associates the request with the tracer. The tracer is configured to log tracing information based on an execution of a second set of operations caused by the request and to obtain a second measurement of performance of a second span that is a child span of the first span.

Abstract: Disclosed systems relate to automatically instrumenting a web application for tracing. In an example, a method includes providing a web page application to a web browser on a client device. The web page application includes a tracer application. The method further includes detecting a start of the web page application and instantiating tracer application. The tracer application is configured to log tracing data for the web page application. The method further includes detecting an event initiated by interaction with the web page application. The method further includes automatically logging a start of a span based on the detection, the logging associating the span with the tracer application. The method further includes executing operations corresponding to the event. The method further includes automatically logging an end of the span based upon a completion of the operations corresponding to the event.

Abstract: Disclosed techniques relate to tracing a subsidiary thread of a web page application. In an example, a method includes providing a web page application to a web browser. The method further includes creating, from the web page application, a global tracer configured to log tracing data for the web page application and a span. The method further includes instantiating, from the web page application, a wrapper for a subsidiary thread. The wrapper is configured to execute shim code before executing the subsidiary thread. The method further includes passing, from the wrapper to the shim code, configuration data of the global tracer. The method further includes creating a subsidiary tracer from the shim code and the configuration data. The subsidiary tracer configured to log tracing data for the subsidiary thread and a thread span.

Abstract: Disclosed techniques relate to automatically instrumenting a web application. In an aspect, a method identifies that a web application includes an event that is triggered by a user interaction. The method associates the event with a tracer that is configured to log tracing information based on an execution of a first set of operations caused by the event and to obtain a first measurement of performance of a first span. The method identifies, in the code, that the execution of a first set of operations causes a request to be made to a server. The method associates the request with the tracer. The tracer is configured to log tracing information based on an execution of a second set of operations caused by the request and to obtain a second measurement of performance of a second span that is a child span of the first span.

Abstract: Disclosed techniques relate to tracing a subsidiary thread of a web page application. In an example, a method includes providing a web page application to a web browser. The method further includes creating, from the web page application, a global tracer configured to log tracing data for the web page application and a span. The method further includes instantiating, from the web page application, a wrapper for a subsidiary thread. The wrapper is configured to execute shim code before executing the subsidiary thread. The method further includes passing, from the wrapper to the shim code, configuration data of the global tracer. The method further includes creating a subsidiary tracer from the shim code and the configuration data. The subsidiary tracer configured to log tracing data for the subsidiary thread and a thread span.

Abstract: Disclosed techniques relate to automatically instrumenting a web application. In an aspect, a method identifies that a web application includes an event that is triggered by a user interaction. The method associates the event with a tracer that is configured to log tracing information based on an execution of a first set of operations caused by the event and to obtain a first measurement of performance of a first span. The method identifies, in the code, that the execution of a first set of operations causes a request to be made to a server. The method associates the request with the tracer. The tracer is configured to log tracing information based on an execution of a second set of operations caused by the request and to obtain a second measurement of performance of a second span that is a child span of the first span.

Abstract: Disclosed techniques relate to automatically instrumenting a web application. In an aspect, a method identifies that a web application includes an event that is triggered by a user interaction. The method associates the event with a tracer that is configured to log tracing information based on an execution of a first set of operations caused by the event and to obtain a first measurement of performance of a first span. The method identifies, in the code, that the execution of a first set of operations causes a request to be made to a server. The method associates the request with the tracer. The tracer is configured to log tracing information based on an execution of a second set of operations caused by the request and to obtain a second measurement of performance of a second span that is a child span of the first span.

Abstract: Disclosed techniques relate to automatically instrumenting a web application. In an aspect, a method identifies that a web application includes an event that is triggered by a user interaction. The method associates the event with a tracer that is configured to log tracing information based on an execution of a first set of operations caused by the event and to obtain a first measurement of performance of a first span. The method identifies, in the code, that the execution of a first set of operations causes a request to be made to a server. The method associates the request with the tracer. The tracer is configured to log tracing information based on an execution of a second set of operations caused by the request and to obtain a second measurement of performance of a second span that is a child span of the first span.

Abstract: Disclosed techniques relate to tracing a subsidiary thread of a web page application. In an example, a method includes providing a web page application to a web browser on a client device. The method further includes creating, from the web page application, a global tracer configured to log tracing data for the web page application and a span. The method further includes instantiating, from the web page application, a wrapper for a subsidiary thread. The wrapper is configured to execute shim code before executing the subsidiary thread. The method further includes passing, from the wrapper to the shim code, configuration data of the global tracer. The method further includes creating a subsidiary tracer from the shim code and the configuration data.

Abstract: Disclosed systems relate to propagating tracing across a distributed software application. In an example, an application logs tracing data for a web page from an original server. The application determines, at the web browser, that the web page from the original server requires a request to an external server outside a domain of the original server. The application interrogates the external server to determine whether the external server allows tracing headers in requests. The application updates an allow list, at the web browser, to indicate that the external server allows tracing headers in requests from the original server. The application injects a tracing header in the request based on a result of the interrogation. The application sends, from the web browser to the external server, the request with the tracing header. The external server is configured to log tracing data based on the tracing header.

Abstract: Disclosed systems relate to automatically instrumenting a web application for tracing. In an example, a method includes providing a web page application to a web browser on a client device. The web page application includes a tracer application. The method further includes detecting a start of the web page application and instantiating tracer application. The tracer application is configured to log tracing data for the web page application. The method further includes detecting an event initiated by interaction with the web page application. The method further includes automatically logging a start of a span based on the detection, the logging associating the span with the tracer application. The method further includes executing operations corresponding to the event. The method further includes automatically logging an end of the span based upon a completion of the operations corresponding to the event.