grafana loki query example

In the case of an error, for example, if the line is not in the expected format, the log line will not be filtered but a new __error__ tag will be added. --> Fixes #25205 **Special notes for your reviewer**: 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 regex . Signature: trimPrefix(prefix string, src string) string. For example if you collect a stream named host for all your incoming logs you'd query for: You should note that at present a stream selector is always required for querying logs. A more granular log stream selector then reduces the number of searched streams to a manageable volume. The same rules that apply to the Prometheus tag selector also apply to the Loki log stream selector. 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. Teams. These links appear in the log details. After parsing the log using the JSON parser, you can see that the Grafana-provided panel is differentiated using different colors depending on the value of level, and that the attributes of our log are now added to the Log tab. You can combine the unpack and json parsers (or any other parsers) if the original embedded log line is of a specific format. For example, the parser | regexp "(?P\\w+) (?P[\\w|/]+) \\((?P\\\d+?) Sorry, an error occurred. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Grafana Labs uses cookies for the normal operation of this website. Note: By signing up, you agree to be emailed related product-level information. This topic explains configuring and querying specific to the Loki data source. By default, the system matches and, unless, and or operations with all entries in the right vector. Those extracted labels can then be used for filtering using label filter expressions or for metric aggregations. Signature: unixEpochNanos(date time.Time) string. Java emits logs as JSON. When both sides are label identifiers, for example dst=src, the operation will rename the src label to dst. I don't know how to write this query. If an expression filters out a log line, the pipeline will stop processing the current log line and start processing the next log line. The above query will give us the line as 1.1.1.1 200 3. This powerful feature creates metrics from logs. For example cluster="namespace" where cluster is the tag identifier, the operator is = and the value is "namespace". Learn more about Teams Additional helpful documentation, links, and articles: Scaling and securing your logs with Grafana Loki, Managing privacy in log data with Grafana Loki. 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. Signature: min(a interface{}, i interface{}) int64. order the filtering stages left to right: Within this query, the stream selector is. Q&A for work. You can only alert on metric queries in Loki, yes. as label_format; all expressions must be quoted. Unlike logfmt and json (which extract all values implicitly and without arguments), the regexp parser takes a single argument | regexp "" in the form of a regular expression using Golang RE2 syntax. This function returns the current log line. Loki indexes only the date, system name and a label for logs. Note: By signing up, you agree to be emailed related product-level information. Open positions, Check out the open source projects we support What happened? 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. Asking for help, clarification, or responding to other answers. You can find some examples of it here: Query Frontend | Grafana Loki documentation Do note that pull mode is generally recommended. Returns a float value with the remainder rounded to the given number of digits after the decimal point. This means that fewer tags lead to smaller indexes, which leads to better performance, so we should always think twice before adding tags. You can wrap predicates with parenthesis to force a different precedence. A label name can only appear once in each expression, which means that | label_format foo=bar,foo="new" is not allowed, but you can use two expressions to achieve the desired effect, such as | label_format foo=bar | label_format foo="new" . Label filters can be place anywhere in a log pipeline. You can specify one or more expressions in this way, the same Use this function to remove given characters from the front or back of a string. Its possible to strip ANSI sequences from the log line, making it easier Add log message in alert Issue #5844 grafana/loki GitHub Sets the data source thats pre-selected for new panels. See Matching IP addresses for details. What does 'They're at four. For example, using | unpack with the log line: extracts the container and pod labels; it sets original log message as the new log line. Only when using the bottomk and topk functions, we can enter the relevant arguments to the functions. Of the log lines identified with the stream selector, If the expression starts with literals, then the log line must also start with the same set of literals. For example, the following log line data. 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. by and without are only used to group the input vector. Grafana lists these variables in dropdown select boxes at the top of the dashboard to help you change the data displayed in your dashboard. Returns the number of seconds elapsed since January 1, 1970 UTC. By default, the matching is case-sensitive and can be switched to be case-insensitive by prefixing the regular expression with (?i). 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 discarding those lines that do not match the case-sensitive expression. After parsing, these attributes can be extracted as follows. How about saving the world? to count error level log entries greater than 10 within 5 minutes. $ ( '.custom-widget-menu-toggle, .toggle-menu-children' ).removeClass ( 'menu-opened' ); @ismail is currently assigned the tasks to bring it to parity and remove the old The |=, |~ and ! IT admins should learn how the tool works, with log streams and a proprietary query language. It's not them. the line: Label filter expression allows filtering log line using their original and extracted labels. Note: By signing up, you agree to be emailed related product-level information. A metric conversion for a label may fail. To make querying efficient, Their behavior can be modified by providing bool after the operator, which will return 0 or 1 for the value rather than filtering. Well demo all the highlights of the major release: new and updated visualizations and themes, data source improvements, and Enterprise features. character does not match newlines by default. by level: Get the rate of HTTP GET requests to the /home endpoint for NGINX logs by region: Sorry, an error occurred. Which can be used to aggregate over distinct labels dimensions by including a without or by clause. Install Grafana Loki with Docker or Docker Compose, 0003: Query fairness across users within tenants, Many-to-one and one-to-many vector matches, A numeric label filter may fail to turn a label value into a number. You can use a match-all regex together with a stream you have for all your logs. For example, given these fake logs: GET /foo/bar GET /foo/baz GET /quux/ GET /foo GET /baz Log range aggregations A query in Grafana, based on a Loki data source. Loki template variables | Grafana documentation The left side can also be a template string, e.g. Open positions, Check out the open source projects we support Loki query to show all logs - Stack Overflow If it matches, then the timeseries is returned with the label dst_label replaced by the expansion of replacement. The without clause removes the listed labels from the resulting vector, keeping all others. $1 is replaced with the first matching subgroup, It typically consists of one or more expressions, each executed in turn for each log line. All log streams that have both a label of app whose value is mysql Note: If you use Grafana Cloud, you can request modifications to this feature by opening a support ticket in the Cloud Portal. {host=~ ". This function performs simple string replacement. Why? For example, if we want to filter logs with level=error, we just use the expression {app="fake-logger"} | json | level="error" to do so. The logfmt parser produces the duration and status_code labels, When a gnoll vampire assumes its hyena form, do its HP change? 1-Local-Configuration-Example.yaml auth_enabled: false server: http_listen_port: 3100 common: ring: instance_addr: 127.0.0.1 kvstore: store: inmemory replication_factor: 1 path_prefix: /tmp/loki schema_config: configs: - from: 2020-05-15 store: boltdb-shipper object_store: filesystem schema: v11 index: prefix: index_ period: 24h A special property _entry will also be used to replace the original log line. Sorry, an error occurred. Hi Grafana team, Could you provide add/remove button in kick start your query for admin to add customized query examples. To evaluate the logical and first, use parenthesis, as in this example: Label filter expressions are the only expression allowed after the unwrap expression. Queries act as if they are a distributed grep to aggregate log sources. The following label matching operators are supported: =: exactly equal. 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. A minor scale definition: am I missing something? Use {host=~ ".+"} That should work always. We dont need most of the preceding log data, we just need to use <_> for placeholders, which is obviously much simpler than regular expressions. The = operator after the label name is a label matching operator. Loki defines Time Durations with the same syntax as Prometheus. The text template format used in | line_format and | label_format support the usage of functions. Adding EV Charger (100A) in secondary panel (100A) fed off main (200A). Additional helpful documentation, links, and articles: Scaling and securing your logs with Grafana Loki, Managing privacy in log data with Grafana Loki. Between two vectors, a binary arithmetic operator is applied to each entry in the left-hand side vector and its matching element in the right-hand vector. 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. Alternatively you can remove all error using a catch all matcher such as __error__ = "" or even show only errors using __error__ != "". Loki derived fields and correlation between logs and traces - Grafana Grafana Labs uses cookies for the normal operation of this website. Like PromQL, LogQL is filtered using tags and operators, and has two main types of query functions. A complete query with a regular expression: Keep log lines that contain a substring that starts with error=, with a value greater than 30 sections. Supports multiple numbers. And you'll see this. String type work exactly like Prometheus label matchers use in log stream selector. Signature: trunc(count int,value string) string, Signature: substr(start int,end int,value string) string. The pattern parser is easier and faster to write; it also outperforms the regexp parser. Supports multiple numbers. and !="out of order". 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") Use interval and range variables of these in any level of nesting (my.list[0]["field"]). Signature: nindent(spaces int,src string) string. Query frontend caches and reuses them later if applicable. There are examples in Multiple parsers. A function is applied to aggregate the query over the duration. The labels will be extracted as shown below. Example of a query to filter Loki querier jobs which create time is 1 day before: Returns the number of milliseconds elapsed since January 1, 1970 UTC. These filter operators are supported: Note: Unlike the label matcher regex operators, the |~ and !~ regex operators are not fully anchored. ~). 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. Grafana Loki documentation LogQL: Log query language Query examples Open source Query examples These LogQL query examples have explanations of what the queries accomplish. Any other queries to help debug would be appreciated! will result in having the following labels extracted: Similar to JSON, using | logfmt label="expression", another="expression" in the pipeline will result in extracting only the fields specified by the labels. All labels are added as variables in the template engine.

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