grafana loki query example

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. A Log Stream represents log entries that have the same metadata (set of Labels). loki is the main server, responsible for storing logs and processing queries. The use cases can be designed based on business by admin. The same rules that apply to the Prometheus tag selector also apply to the Loki log stream selector. #This partial configuration uses IBM Cloud Object Storage (COS) for chunk storage. At the moment it is not possible to run nested queries in Grafana variables for Loki e.g. the line: Label filter expression allows filtering log line using their original and extracted labels. Their behavior can be modified by providing bool after the operator, which will return 0 or 1 for the value rather than filtering. This means that all the following expressions are equivalent: The precedence for evaluation of multiple predicates is left to right. They cannot start with a digit.). Since the logs of our sample application are in JSON form, we can use a JSON parser to parse the logs with the expression {app="fake-logger"} | json, as shown below. Allows extracting container and pod tags and raw log messages as new log lines. 565), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. Lokis strength lies in parallel querying, using filter expressions (label=text, |~ regex, ) to query the logs will be more efficient and fast. To learn more, see our tips on writing great answers. For example, if the prometheus response return 300 separate time-series blocks, the response can be quite big, even if the number of data points for 1 time-series is smaller. What does 'They're at four. If start is >= 0 and end < 0 or end bigger than s length, this calls value[start:] The renamed form dst=src will remove the src tag after remapping it to the dst tag, however, the template form will retain the referenced tag, for example dst="{{.src}}" results in both dst and src having the same value. Optionally, the log stream selector can be followed by a log pipeline. Use <_> at the beginning of the expression if you dont want to anchor the expression at the start. vector1 or vector2 results in a vector that contains all original elements (label sets + values) of vector1 and additionally all elements of vector2 which do not have matching label sets in vector1. All LogQL queries contain a log stream selector. These LogQL query examples have explanations of what the queries accomplish. This complete query example will give results that include the string error, Parser expression can parse and extract labels from the log content. What were the most popular text editors for MS-DOS in the 1980s? From the Queries I've been executing nothing is returned. This function performs simple string replacement. All labels, including extracted ones, will be available for aggregations and generation of new series. Too many tag combinations can create a lot of streams, and it can make Loki store a lot of indexes and small chunks of object files. Loki supports functions to operate on data. Is it still in development? A query in Grafana, based on a Loki data source. The aggregation is applied over a time duration. Of the log lines identified with the stream selector, Install Grafana Loki with Docker or Docker Compose, 0003: Query fairness across users within tenants. For example the parser | regexp "(?P\\w+) (?P[\\w|/]+) \\((?P\\d+? How about saving the world? See vector aggregation examples for query examples that use vector aggregation expressions. Is there a Loki query that returns all the logs? Well demo all the highlights of the major release: new and updated visualizations and themes, data source improvements, and Enterprise features. Use this function to convert to lower case. Sets the HTTP protocol, IP, and port of your Loki instance, such as. If we wish to match only the contents of msg=", we can use the following expression to do so. it is almost always better to have them at the beginning. over the aggregated logs from the matching log streams. For details, see the template variables documentation. Curly braces ({ and }) delimit the stream selector. Select Show example log message to display a text area where you can enter a log message. Mulitply numbers. Grafana Labs uses cookies for the normal operation of this website. For example, {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. order the filtering stages left to right: Within this query, the stream selector is. The timezone value can be Local, UTC, or any of the IANA Time Zone database values, Signature: toDateInZone(fmt, zone, str string) time.Time. 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. After parsing, these attributes can be extracted as follows. When a gnoll vampire assumes its hyena form, do its HP change? include only those log lines that contain the string metrics.go Email [email protected] for help. character does not match newlines by default. {host=~ ". Parser expressions parse and extract tags from log content, and these extracted tags can be used in tag filtering expressions for filtering, or for metric aggregation. Sorry, an error occurred. followed by text or a regular expression. and can be equivalently expressed by a comma, a space or another pipe. Note: If you use Grafana Cloud, you can request modifications to this feature by opening a support ticket in the Cloud Portal. Supports multiple numbers. Install Grafana Loki with Docker or Docker Compose, 0003: Query fairness across users within tenants. All labels are injected variables into the template and are available to use with the {{.label_name}} notation. Grafana Labs uses cookies for the normal operation of this website. Since label values are string, by default a conversion into a float (64bits) will be attempted, in case of failure the __error__ label is added to the sample. =: unequal String type work exactly like Prometheus label matchers use in log stream selector. Defines which cookies are forwarded to the data source. Loki indexes only the date, system name and a label for logs. However to select which label will be used within the aggregation, the log query must end with an unwrap expression and optionally a label filter expression to discard errors. You must explicitly request matching by using the group_left or group_right modifier, where left or right determines which vector has the higher cardinality. And a label should only appear in one of the lists specified by on and group_x. Decodes a JSON document into a structure. Connect and share knowledge within a single location that is structured and easy to search. For example, |json first_server="servers[0]", ua="request.headers[\"User-Agent\"] will extract tags from the following log files. Adding | json to your pipeline will extract all json properties as labels if the log line is a valid json document. =~: regex matches. ~, regular expressions with Golangs RE2 syntax can be used. A log pipeline can be appended to a log stream selector to further process and filter log streams. This will indent every line of text by 4 space characters and add a new line to the beginning. On the other hand, Grafana Loki can be run smoothly on a relatively small server. 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. This is useful when aligning multi-line strings. The logfmt parser can operate in two modes: The logfmt parser can be added using | logfmt and will extract all keys and values from the logfmt formatted log line. A predicate contains a label identifier, an operation and a value to compare the label with. For example, select pod and then select the loki-grafana pod to query all logs from this specific pod. without removes the listed labels from the result vector, while all other labels are preserved the output. The following query shows how you can reformat a log line to make it easier to read on screen. (e.g .label_name ). I've looked through documentation, and so far, I haven't found any such Loki query. Signature: repeat(c int,value string) string. Note: By signing up, you agree to be emailed related product-level information. Unlike the logfmt and json, which extract implicitly all values and takes no parameters, the regexp parser takes a single parameter | regexp "" which is the regular expression using the Golang RE2 syntax. Is there a generic term for these trajectories? This function returns the current log lines timestamp. Log query examples Examples that filter on IP address Return log lines that are not within a range of IPv4 addresses: {job_name="myapp"} != ip ("192.168.4.5-192.168.4.20") You can find some examples of it here: Query Frontend | Grafana Loki documentation Do note that pull mode is generally recommended. 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". New navigation. Sorry, an error occurred. For example, lets look at the following log line data. The log message format is shown below. Open positions, Check out the open source projects we support I am interested in monitoring a variable in a log that takes different values over time. Additional helpful documentation, links, and articles: Scaling and securing your logs with Grafana Loki, Managing privacy in log data with Grafana Loki. Count all the log lines within the last five minutes for the traefik namespace. 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. How to have multiple colors with a single material on a single object?
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