grafana loki query example

Install Grafana Loki with Docker or Docker Compose, 0003: Query fairness across users within tenants. Step 3: Search by the name Loki. A capture is a field name delimited by the < and > characters. The aggregation function we can describe with the following expression. If we have the following labels ip=1.1.1.1, status=200 and duration=3000(ms), we can divide duration by 1000 to get the value in seconds. Alternatively, you can use the \s (match whitespaces, including newline) in combination with \S (match not whitespace characters) to match all characters, including newlines. If the bool modifier is provided, vector elements that would be dropped instead have the value 0 and vector elements that would be kept have the value 1. You can take advantage of pipeline to join together multiple functions. If a capture is not matched, the pattern parser will stop. Its possible to strip ANSI sequences from the log line, making it easier All labels are injected variables into the template and are available to use with the {{.label_name}} notation. within the last minutes per host for the MySQL job, The aggregation is applied over a time duration. 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. Between two literals, the behavior is obvious: Monitoring your docker container's logs the Loki way Use the following command to create the sample application. The last example will return world world. For instructions on how to add a data source to Grafana, refer to the administration documentation. Defaults to 1,000. use LogQL syntax wisely to dramatically improve query efficiency. Hope you'll catch the bug", How to get the caller's function name, filename, and line number in a Go function, How to automatically set worker_processes for nginx containers, https://github.com/opsgenie/kubernetes-event-exporter/tree/master/deploy, https://grafana.com/grafana/dashboards/14003, Calculating relevant metrics in the log stream by filtering rules, If the log line is a valid json document, adding, Application name: kubernetes/labels/app_kubernetes_io/name. For multi-row LogQL queries, you can use # to exclude whole or partial rows. saada commented on Apr 8, 2022 edited A metric query for triggering the alert itself An optional log query to pass in to the message template such as { { $log := range .LogMessages }} rkonfj mentioned this issue on Dec 1, 2022 We use fluent-bit for logs processing from java application to kaffra (redpanda actually). dst="{{.status}} {{.query}}", in which case the dst tag value will be replaced by the Golang template execution result, which is the same template engine as the | line_format expression, which means that the tag can be used as a variable, or the same function list. Downloads. The without clause removes the listed labels from the resulting vector, keeping all others. Signature: minf(a interface{}, i interface{}) float64, Returns the greatest float value greater than or equal to input value, Returns the greatest float value less than or equal to input value. The results are grouped by parent path. Will extract and rewrite the log line to only contains the query and the duration of a request. LogQL: Log query language LogQL is Grafana Loki's PromQL-inspired query language. Loki Ruler not sending alerts to alert Manager, How to visualize Loki JSON logs in Grafana. A tag filter expression allows to filter log lines using their original and extracted tags, and it can contain multiple predicates. Like PromQL, LogQL supports a subset of built-in aggregation operators that can be used to aggregate the element of a single vector, resulting in a new vector of fewer elements but with aggregated values: The aggregation operators can either be used to aggregate over all label values or a set of distinct label values by including a without or a by clause: parameter is required when using topk and bottomk. All labels are added as variables in the template engine. You can specify one or more expressions in this way, the same A log pipeline can be appended to a log stream selector to further process and filter log streams. A Log Stream represents log entries that have the same metadata (set of Labels). LogQL uses labels and operators for filtering. such that they can be used by a label filter. Inspired by PromQL, Loki also has its own query language, called LogQL, which is like a distributed grep that aggregates views of logs. The log stream selector determines which log streams should be included in your query results. Get started with Grafana and MS SQL Server, Encrypt database secrets using Google Cloud KMS, Encrypt database secrets using Hashicorp Vault, Encrypt database secrets using Azure Key Vault, Assign or remove Grafana server administrator privileges, Activate a Grafana Enterprise license purchased through AWS Marketplace, Activate a Grafana Enterprise license from AWS Marketplace on EKS, Activate a Grafana Enterprise license from AWS Marketplace on ECS, Activate a Grafana Enterprise license from AWS on an instance deployed outside of AWS, Manage your Grafana Enterprise license in AWS Marketplace, Transfer your AWS Marketplace Grafana Enterprise license, Create and manage alerting resources using file provisioning, Create and manage alerting resources using Terraform, Create Grafana Mimir or Loki managed alert rules, Create Grafana Mimir or Loki managed recording rules, Grafana Mimir or Loki rule groups and namespaces, Performance considerations and limitations, API Tutorial: Create API tokens and dashboards for an organization, Add authentication for data source plugins, Add distributed tracing for backend plugins, opening a support ticket in the Cloud Portal. Grafana Labs uses cookies for the normal operation of this website. # If we pass both trusted profile name and trusted profile ID it should be of # the same trusted profile. It takes as parameter a comma separated list of equality operations, enabling multiple operations at once. Signature: repeat(c int,value string) string. and do not contain the string out of order. A special property _entry will also be used to replace the original log line. The navigation in Grafana has been updated with a new design and an improved structure to make it easier for you to access the data you need. vector1 unless vector2 results in a vector consisting of the elements of vector1 for which there are no elements in vector2 with exactly matching label sets. Grafana refers to such variables as template variables. The matching is case-sensitive by default. specified json fields to labels. The right side can alternatively be a template string (double quoted or backtick), for example dst="{{.status}} {{.query}}", in which case the dst label value is replaced by the result of the text/template evaluation. This means that all the following expressions are equivalent: The precedence for evaluation of multiple predicates is left to right. LogQL is Grafana Lokis PromQL-inspired query language. LogQL: Log query language | Grafana Loki documentation LogQL queries can be annotated with the # character, e.g. Grafana, often with Prometheus, is a popular open source platform for monitoring and observability that can be used to query, visualize, and create alerts on a number of metric and data sources. For example, for the query {job="varlogs"}|json|drop __error__, with below log line, For the query {job="varlogs"}|json|drop level, path, app=~"some-api. Well demo all the highlights of the major release: new and updated visualizations and themes, data source improvements, and Enterprise features. Well demo all the highlights of the major release: new and updated visualizations and themes, data source improvements, and Enterprise features. In both cases, if the destination label doesnt exist, then a new one is created. And a label should only appear in one of the lists specified by on and group_x. These logical/set binary operators are only defined between two vectors: vector1 and vector2 results in a vector consisting of the elements of vector1 for which there are elements in vector2 with exactly matching label sets. Note: By signing up, you agree to be emailed related product-level information. Use this function to trim just the prefix from a string. If the conversion of the label value fails, the log line is not filtered and an __error__ label is added. The pattern parser allows fields to be extracted explicitly from log lines by defining a pattern expression (| pattern "") that matches the structure of the log line. Grafana Labs uses cookies for the normal operation of this website. The log line can be parsed with the following expression. For example, using | unpack with the log line: extracts the container and pod labels; it sets original log message as the new log line. Signature: unixEpoch(date time.Time) string. Note: By signing up, you agree to be emailed related product-level information. 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 The Settings tab of the data source is displayed. To learn more, see our tips on writing great answers. Only when using the bottomk and topk functions, we can enter the relevant arguments to the functions. Could a subterranean river or aquifer generate enough continuous momentum to power a waterwheel for the purpose of producing electricity? Defines which cookies are forwarded to the data source. Combined with parsers, metric queries can also be used to calculate metrics from a sample value within the log line, such as latency or request size. It searches the contents of the log line, The aggregation is applied over a time duration. Select Show example log message to display a text area where you can enter a log message. Supports multiple numbers. While every query will have a stream selector, I've looked through documentation, and so far, I haven't found any such Loki query. This contrived query will return the intersection of these queries, effectively rate({app="bar"}): Comparison operators are defined between scalar/scalar, vector/scalar, and vector/vector value pairs. When you are. In addition, we can format the output logs according to our needs using line_format, for example, we use the query statement {app="fake-logger"} | json |is_even="true" | line_format "logs generated in {{.time}} on {{.level}}@ {{.pod}} Pod generated log {{.msg}}" to format the log output. Each expression is executed in left to right sequence for each log line. Alert on every log entry - Grafana Loki - Grafana Labs Community Forums The Derived Fields configuration helps you: For example, you can link to your tracing backend directly from your logs, or link to a user profile page if the log line contains a corresponding userId. 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. Returns a textual representation of the time value formatted according to the provided golang datetime layout. LogQL supports a variety of value types that are automatically inferred from the query input. Returns the number of seconds elapsed since January 1, 1970 UTC. There are two types of LogQL queries: Log queries return the contents of log lines. These links appear in the log details. A function is applied to aggregate the query over the duration. Level Up Coding Configure Serilog with Grafana Loki Paris Nakita Kejser in DevOps Engineer, Software Architect and Software Developering Setup monitoring with Prometheus and Grafana in. Then import the Dashboard at https://grafana.com/grafana/dashboards/14003, but be careful to change the filter tag in each chart to job="monitoring/event-exporter". Learn more about Teams Log line filtering expressions are used to perform a distributed grep on aggregated logs in a matching log stream. Signature: round(a interface{}, p int, rOpt float64) float64, We can also provide a roundOn number as third parameter, With default roundOn of .5 the above value would be 123.88571, Signature: toFloat64(v interface{}) float64. Why in the Sierpiski Triangle is this set being used as the example for the OSC and not a more "natural"? Use this function to repeat a string multiple times. Grafana Labs uses cookies for the normal operation of this website. Here we deploy a sample application that is a fake logger with debug, info and warning logs output to stdout. The = operator after the tag name is a tag matching operator, and there are several tag matching operators supported in LogQL. ~). At the moment it is not possible to run nested queries in Grafana variables for Loki e.g. The unnamed capture skips matched content. If an extracted label key name already exists in the original log stream, the extracted label key will be suffixed with the _extracted keyword to make the distinction between the two labels. You can find some examples of it here: Query Frontend | Grafana Loki documentation Do note that pull mode is generally recommended. The only way to filter out errors is by using a label filter expressions. {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. The timezone value can be Local, UTC, or any of the IANA Time Zone database values, Signature: toDateInZone(fmt, zone, str string) time.Time. 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 A Log Stream Selector determines how many logs will be searched for. and can be equivalently expressed by a comma, a space or another pipe. Log line formatting expressions can be used to rewrite the contents of log lines by using Golangs text/template template format, which takes a string parameter | line_format "{{.label_name}}" as the template format, and all labels are variables injected into the template and can be used with the {.label_name }} notation to be used. Returns a float value with the remainder rounded to the given number of digits after the decimal point. What was the actual cockpit layout and crew of the Mi-24A? If the bool modifier is provided, vector elements that would have been dropped instead have the value 0 and vector elements that would be kept have the value 1, with the grouping labels again becoming the output label set. If start is >= 0 and end < 0 or end bigger than s length, this calls value[start:] Log queries | Grafana Loki documentation as it only does further processing when a line matches. --> Fixes #25205 **Special notes for your reviewer**:

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grafana loki query example

grafana loki query example