Package com.google.cloud.logging (3.15.17)

A client for Cloud Logging - Real-time log management and analysis.

Here's a simple usage example for using google-cloud from Compute Engine/App Engine Flexible. This example shows how to write and list log entries. For the complete source code see WriteAndListLogEntries.java.


 LoggingOptions options = LoggingOptions.getDefaultInstance();
 try(Logging logging = options.getService()) {

   LogEntry firstEntry = LogEntry.newBuilder(StringPayload.of("message"))
       .setLogName("test-log")
       .setResource(MonitoredResource.builder("global")
           .addLabel("project_id", options.getProjectId())
           .build())
       .build();
   logging.write(Collections.singleton(firstEntry));

   Page<LogEntry> entries = logging.listLogEntries(
   EntryListOption.filter("logName=projects/" + options.getProjectId() + "/logs/test-log"));
   Iterator<LogEntry> entryIterator = entries.iterateAll();
   while (entryIterator.hasNext()) {
     System.out.println(entryIterator.next());
   }
 }

This second example shows how to use a java.util.logging.Logger to write log entries to Cloud Logging. The snippet installs a Cloud Logging handler using LoggingHandler.addHandler(Logger, LoggingHandler). Notice that this could also be done through the logging.properties file, adding the following line:

 com.google.cloud.examples.logging.snippets.AddLoggingHandler.handlers=com.google.cloud.logging.LoggingHandler

For the complete source code see AddLoggingHandler.java.


 Logger logger = Logger.getLogger(AddLoggingHandler.class.getName());
 LoggingHandler.addHandler(logger, new LoggingHandler());
 logger.warning("test warning");

Classes

Context

Class to hold context attributes including information about {@see HttpRequest} and tracing.

Context.Builder

A builder for {@see Context} objects.

ContextHandler

Class provides a per-thread storage of the {@see Context} instances.

Exclusion

Specifies a set of log entries that are not to be stored in Logging. If your GCP resource receives a large volume of logs, you can use exclusions to reduce your chargeable logs. Exclusions are processed after log sinks, so you can export log entries before they are excluded. Note that organization-level and folder-level exclusions don't apply to child resources, and that you can't exclude audit log entries.

Exclusion.Builder

A builder for Exclusion objects.

HttpRequest

Objects of this class represent information about the (optional) HTTP request associated with a log entry. See Also: Http Request

HttpRequest.Builder

A builder for HttpRequest objects.

HttpRequest.RequestMethod

The HTTP request method.

Instrumentation

LogDestinationName

Class for specifying resource name of the log to which this log entry belongs (see 'logName' parameter in https://cloud.google.com/logging/docs/reference/v2/rest/v2/LogEntry)

LogEntry

A Cloud Logging log entry. All log entries are represented via objects of this class. Log entries can have different type of payloads: an UTF-8 string (see Payload.StringPayload), a JSON object (see Payload.JsonPayload, or a protobuf object (see Payload.ProtoPayload). Entries can also store additional information about the operation or the HTTP request that generated the log (see LogEntry#getOperation() and LogEntry#getHttpRequest(), respectively). See Also: Log Entries and Logs

LogEntry.Builder

A builder for LogEntry objects.

LogEntryIterator

The class implements {@see Iterator} interface over {@see LogEntry} by iterating through {@see TailLogEntriesResponse} streamed by BidiStream. This class is instantiated by {@see LogEntryServerStream} and is not intended to be used explicitly.

LogEntryServerStream

The class implements Iterable interface over {@see LogEntry}. It wraps around BidiStream bi-directional gRPC stream to support iterating through ingested responses. The class uses {@see LogEntryIterator} to iterate through the processed responses. The stream should be explicitly canceled by calling {@see LogEntryServerStream#cancel()} method. The class does not provide recovery or resuming functionality over the stream.

To iterate run:


 LogEntryServerStream stream;
 // code to initialize stream
 for (LogEntry log : stream) {
   // do something with logs
 }
 stream.cancel();

The iteration can be blocked on waiting for another response sent in the stream.

Logging.EntryListOption

Class for specifying options for listing log entries.

Logging.ListOption

Class for specifying options for listing sinks, monitored resources and monitored resource descriptors.

Logging.TailOption

Class for specifying options for tailing log entries.

Logging.WriteOption

Class for specifying options for writing log entries.

LoggingHandler

A logging handler that outputs logs generated with java.util.logging.Logger to Cloud Logging.

Java logging levels (see java.util.logging.Level) are mapped to the following Google Cloud Logging severities:

Mapping of Java logging level to Cloud Logging severities
Java Level	Cloud Logging Severity
SEVERE	ERROR
WARNING	WARNING
INFO	INFO
CONFIG	INFO
FINE	DEBUG
FINER	DEBUG
FINEST	DEBUG

Original Java logging levels are added as labels (with levelName and levelValue keys, respectively) to the corresponding Cloud Logging LogEntry. You can read entry labels using LogEntry#getLabels(). To use logging levels that correspond to Cloud Logging severities you can use LoggingLevel.

Configuration: By default each LoggingHandler is initialized using the following LogManager configuration properties (that you can set in the logging.properties file). If properties are not defined (or have invalid values) then the specified default values are used.

com.google.cloud.logging.LoggingHandler.log the log name (defaults to java.log).
com.google.cloud.logging.LoggingHandler.level specifies the default level for the handler (defaults to Level.INFO).
com.google.cloud.logging.LoggingHandler.filter specifies the name of a Filter class to use (defaults to no filter).
com.google.cloud.logging.LoggingHandler.formatter specifies the name of a Formatter class to use (defaults to SimpleFormatter).
com.google.cloud.logging.LoggingHandler.flushLevel specifies the flush log level. When a log with this level is published, logs are transmitted to the Cloud Logging service (defaults to LoggingLevel#ERROR).
com.google.cloud.logging.LoggingHandler.enhancers specifies a comma separated list of LoggingEnhancer classes. This handler will call each enhancer list whenever it builds a LogEntry instance (defaults to empty list).
com.google.cloud.logging.LoggingHandler.resourceType the type name to use when creating the default MonitoredResource (defaults to auto-detected resource type, else "global").
com.google.cloud.logging.Synchronicity the synchronicity of the write method to use to write logs to the Cloud Logging service (defaults to Synchronicity#ASYNC).
com.google.cloud.logging.LoggingHandler.autoPopulateMetadata is a boolean flag that opts-out the population of the log entries metadata before the logs are sent to Cloud Logging (defaults to true).
com.google.cloud.logging.LoggingHandler.redirectToStdout is a boolean flag that opts-in redirecting the output of the handler to STDOUT instead of ingesting logs to Cloud Logging using Logging API (defaults to false). Redirecting logs can be used in Google Cloud environments with installed logging agent to delegate log ingestions to the agent. Redirected logs are formatted as one line Json string following the structured logging guidelines. This flag is deprecated; use com.google.cloud.logging.LoggingHandler.logTarget instead.
com.google.cloud.logging.LoggingHandler.logTarget is an enumeration controlling log routing (defaults to CLOUD_LOGGING). If set to STDOUT or STDERR, logs will be printed to the corresponding stream in the Json format that can be parsed by the logging agent. If set to CLOUD_LOGGING, logs will be sent directly to the Google Cloud Logging API.

To add a LoggingHandler to an existing Logger and be sure to avoid infinite recursion when logging, use the #addHandler(Logger, LoggingHandler) method. Alternatively you can add the handler via logging.properties. For example using the following line:

 com.example.mypackage.handlers=com.google.cloud.logging.LoggingHandler

LoggingLevel

This class adds some additional Java logging levels for Cloud Logging. Added levels fill in the gap between Java logging levels and Cloud Logging severities.

Added levels in descending order are (between parenthesis the relation with Java logging levels):

EMERGENCY
ALERT
CRITICAL
ERROR (WARNING < ERROR < SEVERE)
NOTICE (INFO < NOTICE < WARNING)
DEBUG (ALL < DEBUG < FINEST

Notice that ERROR is lower than java.util.logging.Level#SEVERE but higher than java.util.logging.Level#WARNING. DEBUG instead is lower than java.util.logging.Level#FINEST but higher than java.util.logging.Level#ALL.

LoggingOptions

LoggingOptions.Builder

LoggingOptions.DefaultLoggingFactory

LoggingOptions.DefaultLoggingRpcFactory

MetadataLoader

Metric

Cloud Logging metrics describe logs-based metric. The value of the metric is the number of log entries that match a logs filter (see #getFilter()).

Metric adds a layer of service-related functionality over MetricInfo. Objects of this class are immutable. To get a Metric object with the most recent information use #reload or #reloadAsync. See Also: Logs-based Metrics

Metric.Builder

A builder for Metric objects.

MetricInfo

Cloud Logging metrics describe logs-based metric. The value of the metric is the number of log entries that match a logs filter (see #getFilter()). See Also: Logs-based Metrics

MetricInfo.Builder

A builder for MetricInfo objects.

MonitoredResourceUtil

Monitored resource construction utilities to detect resource type and add labels. Used by logging framework adapters to configure default resource. See usage in LoggingHandler.

Operation

Additional information about a potentially long-running operation with which a log entry is associated. See Also: Log Entry Operation

Operation.Builder

A builder for Operation objects.

Payload<T>

A base class for log entry payloads. See Also: Log Entries and Logs

Payload.JsonPayload

A log entry's JSON payload.

Payload.ProtoPayload

A log entry payload as a protobuf object.

Payload.StringPayload

A log entry payload as an UTF-8 string.

Sink

Cloud Logging sinks can be used to control the export of your logs. Each sink specifies the export of a set of log entries to a certain destination. A sink consists of a name, unique to the project, a filter for choosing the log entries to export and a destination for the log entries.

Sink destination can either be a Google Cloud Storage bucket (see SinkInfo.Destination.BucketDestination, a Google Cloud BigQuery dataset (see SinkInfo.Destination.DatasetDestination) or a Google CloudPub/Sub topic (see SinkInfo.Destination.TopicDestination).

Sink adds a layer of service-related functionality over SinkInfo. Objects of this class are immutable. To get a Sink object with the most recent information use #reload or #reloadAsync. See Also: About Sinks

Sink.Builder

A builder for Sink objects.

SinkInfo

Sink destination can either be a Google Cloud Storage bucket (see Destination.BucketDestination, a Google Cloud BigQuery dataset (see Destination.DatasetDestination) or a Google Cloud Pub/Sub topic (see Destination.TopicDestination). See Also: About Sinks

SinkInfo.Builder

A builder for SinkInfo objects.

SinkInfo.Destination

SinkInfo.Destination.BucketDestination

Class for specifying a Google Cloud Storage bucket as destination for the sink.

SinkInfo.Destination.DatasetDestination

Class for specifying a Google Cloud BigQuery dataset as destination for the sink.

SinkInfo.Destination.LoggingBucketDestination

SinkInfo.Destination.TopicDestination

Class for specifying a Google Cloud BigQuery dataset as destination for the sink.

SourceLocation

Additional information about the source code location that produced the log entry.

SourceLocation.Builder

A builder for SourceLocation objects.

TimestampDefaultFilter

TraceLoggingEnhancer

Interfaces

ITimestampDefaultFilter

Encapsulates implementation of default time filter. This is needed for testing since we can't mock static classes with EasyMock

Logging

LoggingEnhancer

An enhancer for log entries. Used to add custom labels to the LogEntry.Builder

LoggingFactory

An interface for Logging factories.

ResourceTypeEnvironmentGetter

Enums

LogDestinationName.DestinationType

Logging.SortingField

Fields according to which log entries can be sorted.

Logging.SortingOrder

Sorting orders available when listing log entries.

LoggingHandler.LogTarget

Where to send logs.

MonitoredResourceUtil.Label

Payload.Type

Type for a log entry payload.

Severity

The severity of the event described in a log entry. These guideline severity levels are ordered, with numerically smaller levels treated as less severe than numerically larger levels. If the source of the log entries uses a different set of severity levels, the client should select the closest corresponding Severity value.

Exceptions

LoggingException

Logging service exception.