#This partial configuration uses IBM Cloud Object Storage (COS) for chunk storage. matches the regular expression regex against the label src_label. By default, the system matches and, unless, and or operations with all entries in the right vector. Grafana Loki querying basics, log based metrics and setting - YouTube Well demo all the highlights of the major release: new and updated visualizations and themes, data source improvements, and Enterprise features. Between a vector and a literal, the operator is applied to the value of every data sample in the vector, e.g. Signature: min(a interface{}, i interface{}) int64. Grafana ships with built-in support for Loki, an open-source log aggregation system by Grafana Labs. Email update@grafana.com for help. Open positions, Check out the open source projects we support Signature: nindent(spaces int,src string) string. Parabolic, suborbital and ballistic trajectories all follow elliptic paths. A more granular log stream selector then reduces the number of searched streams to a manageable volume. *"} You should note that at present a stream selector is always required for querying logs. The following binary arithmetic operators exist in Loki: Binary arithmetic operators are defined between two literals (scalars), a literal and a vector, and two vectors. String type work exactly like Prometheus label matchers use in log stream selector. If a capture is not matched, the pattern parser will stop. The above example means that all log streams with the tag app and the value mysql and the tag name and the value mysql-backup will be included in the query results. A minor scale definition: am I missing something? To avoid escaping the featured character, you can use single quotes instead of double quotes when quoting a string, for example \w+1 is the same as \w+. The following label matching operators are supported: =: exactly equal. The last example will return Hello World. For example, to calculate the qps of nginx. Defines a regular expression to evaluate on the log message and capture part of it as the value of the new field. Note: If you use Grafana Cloud, you can request modifications to this feature by opening a support ticket in the Cloud Portal. What happened? (e.g .label_name). Open positions, Check out the open source projects we support {container="query-frontend",namespace="loki-dev"} |= "metrics.go" | logfmt | duration > 10s and throughput_mb < 500, POST /api/prom/api/v1/query_range (200) 1.5s, 0.191.12.2 - - [10/Jun/2021:09:14:29 +0000] "GET /api/plugins/versioncheck HTTP/1.1" 200 2 "-" "Go-http-client/2.0" "13.76.247.102, 34.120.177.193" "TLSv1.2" "US" "", - - <_> " <_>" <_> "" <_>, level=debug ts=2021-06-10T09:24:13.472094048Z caller=logging.go:66 traceID=0568b66ad2d9294c msg="POST /loki/api/v1/push (204) 16.652862ms", <_> msg=" () ", | duration >= 20ms or size == 20kb and method!~"2..", | duration >= 20ms or size == 20kb | method!~"2..", | duration >= 20ms or size == 20kb,method!~"2..", | duration >= 20ms or size == 20kb method!~"2..", | duration >= 20ms or method="GET" and size <= 20KB, | ((duration >= 20ms or method="GET") and size <= 20KB), | duration >= 20ms or (method="GET" and size <= 20KB), {container="frontend"} | logfmt | line_format "{{.query}} {{.duration}}", rate({filename="/var/log/nginx/access.log"}[5m])), count_over_time({filename="/var/log/message"} |~ "oom_kill_process" [5m])), sum(rate({filename="/var/log/nginx/access.log"}[5m])) by (pod), topk(5,sum(rate({filename="/var/log/nginx/access.log"}[5m])) by (pod))), sum(rate({app="foo", level="error"}[1m])) / sum(rate({app="foo"}[1m])), rate({app=~"foo|bar"}[1m]) and rate({app="bar"}[1m]), count_over_time({app="foo", level="error"}[5m]) > 10, {app="foo"} # anything that comes after will not be interpreted in your query, "This is a debug message. See Unwrap examples for query examples that use the unwrap expression. It takes a single string parameter | line_format "{{.label_name}}", which is the template format. Signature: date(fmt string, date interface{}) string. Now that the data in JSON is turned into log tags we can naturally use these tags to filter log data. LogQL queries can be annotated with the # character, e.g. as it only does further processing when a line matches. Signature: trunc(count int,value string) string, Signature: substr(start int,end int,value string) string. This means that the labels passed to the log stream selector will affect the relative performance of the querys execution. if a time series vector is multiplied by 2, the result is another vector in which every sample value of the original vector is multiplied by 2. Signature: unixEpoch(date time.Time) string. Click on Select. Sets the HTTP protocol, IP, and port of your Loki instance, such as. For details, see the template variables documentation. The |=, |~ and ! This will indent every line of text by 4 space characters and add a new line to the beginning. You can use a tag formatting expression to force an override of the original tag, but if an extracted key appears twice, then only the latest tag value will be retained. They can be referenced using they label name prefixed by a . Downloads. The following example returns the rates requests partitioned by app and status as a percentage of total requests. Obviously the mathematical operations in LogQL are oriented towards interval vector operations, and the supported binary operators in LogQL are as follows. Grafana Labs uses cookies for the normal operation of this website. For more information about provisioning, and for available configuration options, refer to Provisioning Grafana. Returns a float value with the remainder rounded to the given number of digits after the decimal point. How a top-ranked engineering school reimagined CS curriculum (Ep. The regular expression must contain at least one named submatch (e.g. For example the following template will output the value of the path label: Additionally you can also access the log line using the __line__ function and the timestamp using the __timestamp__ function. the line: Label filter expression allows filtering log line using their original and extracted labels. with any value other than the value 200, An unnamed capture appears as <_>. I am interested in monitoring a variable in a log that takes different values over time. The log stream selector is optionally followed by a log pipeline for further processing and filtering of log stream information, which consists of a set of expressions, each of which performs relevant filtering for each log line in left-to-right order, each of which can filter, parse and change the log line content and its respective label. This should be clearly stated in examples and documentation: In Grafana 7, you have the transformations tab, select "Labels to Fields . Getting Started with Grafana Loki - Geekflare The same rules that apply to the Prometheus tag selector also apply to the Loki log stream selector. Learn more about Teams specified json fields to labels. Which can be used to aggregate over distinct labels dimensions by including a without or by clause. which streams will be included within the query results. Step One Install Grafana on an EC2 Instance Launch a t2.micro EC2 instance. A metric conversion for a label may fail. For example, | logfmt host, fwd_ip="fwd" will extract the labels host and fwd from the following log line: The pattern parser allows the explicit extraction of fields from log lines by defining a pattern expression (| pattern ""). Python script that identifies the country code of a given IP address. For instance, the pipeline | json will produce the following mapping: In case of errors, for instance if the line is not in the expected format, the log line wont be filtered but instead will get a new __error__ label added. Loki is already present in the data sources of Grafana. Open positions, Check out the open source projects we support Add log message in alert Issue #5844 grafana/loki GitHub Connect Grafana to data sources, apps, and more, with Grafana Alerting, Grafana Incident, and Grafana OnCall, Frontend application observability web SDK, Try out and share prebuilt visualizations, Contribute to technical documentation provided by Grafana Labs, Help build the future of open source observability software Set operations are only valid in the interval vector range, and currently support, LogQL supports the same comparison operators as PromQL, including. The | label_format expression can rename, modify or add labels. All labels are added as variables in the template engine. Nested properties are flattened into label keys using the _ separator. The filter operators can be chained and will filter expressions in order, and the resulting log lines must satisfy each filter. For more consistency between Loki installations, its recommended to use toDateInZone, The format string must use the exact date as defined in the golang datetime layout, Signature: toDate(fmt, str string) time.Time. You can use a match-all regex together with a stream you have for all your logs. This means that fewer tags lead to smaller indexes, which leads to better performance, so we should always think twice before adding tags. Using Loki based variable - Grafana Labs Community Forums Click on "Add data source" and search for Loki and Click on it. The | label_format expression can rename, modify or add labels. These LogQL query examples have explanations of what the queries accomplish. ~, regular expressions with Golangs RE2 syntax can be used.