This commit changes the state package so that errors encountered while
expanding templates for custom labels and annotations are returned
from the function. This is not used at present, but will be used in the
future as we look at how to offer better feedback to users who don't
have access to logs, for example our customers who use Hosted Grafana.
This commit fixes a bug in the $values variable in notification
templates when using Classic Conditions. Since Classic Conditions
are not multi-dimensional, the values of each series that exceeded
the condition should be available as a RefID and offset. For example,
B0, B1, etc. However, this bug meant that instead just a single
condition would be printed as B, not B0.
* remove ResetAllStates because it's not used
* refactor cache to accept logs, metrics and url as method args
* update manager Warm method to set the entire state at once
* remove unused reset method
* introduce ruleStates
* change getOrCreate to belong to ruleStates
* update Get to not return error
* add tests for cache getOrCreate
* update ProcessEvalResults to accept extra lables
* extract to getRuleExtraLabels
* move populating of constant rule labels to extra labels
* Alerting: (wip) add template funcs
* Alerting: (wip) numeric template functions
* Alerting: (wip) template functions
* Test for the "args" function
* Alerting: (wip) Documentation for template functions
* Alerting: template functions - refactor
* code review changes
* disable linter error
* Use Prometheus implementation of TemplateExpander
* Update docs/sources/alerting/unified-alerting/alerting-rules/create-grafana-managed-rule.md
Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>
* change templateCaptureValue to support using template functions
* Update pkg/services/ngalert/state/template.go
Co-authored-by: gotjosh <josue.abreu@gmail.com>
* Test and documentation added for reReplaceAll template function
* complete missing functions, documentation and tests
* Use the alert instance's evaluation time for expanding the template
* strvalue graphlink and tablelink functions
* delete duplicate test
* make strvalue return an empty string
Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>
Co-authored-by: gotjosh <josue.abreu@gmail.com>
* Change templateCaptureValue to support using template functions
This commit changes templateCaptureValue to use float64 for the value
instead of *float64. This change means that annotations and labels can
use the float64 value with functions such as printf and avoid having to
check for nil. It also means that absent values are now printed as 0.
* Use math.NaN() instead of 0 for absent value
* Expand the value of math and reduce expressions in annotations and labels
This commit makes it possible to use the values of reduce and math
expressions in annotations and labels via their RefIDs. It uses the
Stringer interface to ensure that "{{ $values.A }}" still prints the
value in decimal format while also making the labels for each RefID
available with "{{ $values.A.Labels }}" and the float64 value with
"{{ $values.A.Value }}"
