grafana/docs/sources/alerting/images-in-notifications.md

aliases	description	keywords	title
		grafana alerting images notifications	Images in notifications

Images in notifications

Images in notifications helps recipients of alert notifications better understand why an alert has fired or resolved by including an image of the panel for the Grafana managed alert rule.

Note

: Images in notifications are not available for Grafana Mimir and Loki managed alert rules, or when Grafana is set up to send alert notifications to an external Alertmanager.

If Grafana is set up to send images in notifications, it takes a screenshot of the panel for the Grafana managed alert rule when either of the following happen:

1. The alert rule transitions from pending to firing
2. The alert rule transitions from firing to OK

Images are stored in the [data]({{< relref "../setup-grafana/configure-grafana/#paths" >}}) path and so Grafana must have write-access to this path. If Grafana cannot write to this path then taken screenshots cannot be saved to disk and an error will be logged for each failed screenshot attempt. In addition to storing images on disk, Grafana can also store the image in an external image store such as Amazon S3, Azure Blob Storage, Google Cloud Storage and even Grafana where screenshots are stored in public/img/attachments. Screenshots older than temp_data_lifetime are deleted from disk but not the external image store. If Grafana is the external image store then screenshots are deleted from data but not from public/img/attachments.

Note

: It is recommended to use an external image store is used for images in notifications as not all contact points supported uploading images from disk. It is also possible that the image on disk is deleted before an alert notification is sent if temp_data_lifetime is less than the group_wait and group_interval options used in Alertmanager.

Requirements

To use images in notifications, Grafana must be set up to use [image rendering]({{< relref "../setup-grafana/image-rendering/" >}}). It is also recommended that Grafana is set up to upload images to an [external image store]({{< relref "../setup-grafana/configure-grafana/#external_image_storage" >}}) such as Amazon S3, Azure Blob Storage, Google Cloud Storage or even Grafana.

Configuration

If Grafana has been set up to use [image rendering]({{< relref "../setup-grafana/image-rendering/" >}}) images in notifications can be turned on via the capture option in [unified_alerting.screenshots]:

# Enable screenshots in notifications. This option requires a remote HTTP image rendering service. Please
# see [rendering] for further configuration options.
capture = true

It is recommended that max_concurrent_screenshots is set to a value that is less than or equal to concurrent_render_request_limit. The default value for both max_concurrent_screenshots and concurrent_render_request_limit is 5:

# The maximum number of screenshots that can be taken at the same time. This option is different from
# concurrent_render_request_limit as max_concurrent_screenshots sets the number of concurrent screenshots
# that can be taken at the same time for all firing alerts where as concurrent_render_request_limit sets
# the total number of concurrent screenshots across all Grafana services.
max_concurrent_screenshots = 5

If Grafana has been set up to use an external image store, upload_external_image_storage should be set to true:

# Uploads screenshots to the local Grafana server or remote storage such as Azure, S3 and GCS. Please
# see [external_image_storage] for further configuration options. If this option is false, screenshots
# will be persisted to disk for up to temp_data_lifetime.
upload_external_image_storage = false

Restart Grafana for the changes to take affect.

Supported notifiers

Images in notifications are supported in the following notifiers and additional support will be added in the future:

Name	Upload images from disk	Include images from URL
DingDing	No	No
Discord	Yes	Yes
Email	Yes	Yes
Google Hangouts Chat	No	Yes
Kafka	No	No
Line	No	No
Microsoft Teams	No	Yes
Opsgenie	No	Yes
Pagerduty	No	Yes
Prometheus Alertmanager	No	No
Pushover	No	No
Sensu Go	No	No
Slack	No	Yes
Telegram	No	No
Threema	No	No
VictorOps	No	No
Webhook	No	Yes
WeCom	No	No

Include images from URL refers to using the external image store.

Metrics

Grafana provides the following metrics to observe the performance and failure rate of images in notifications. For example, if a screenshot could not be taken within the expected time (10 seconds) then the counter grafana_screenshot_failures_total is updated.

• grafana_screenshot_cache_hits_total
• grafana_screenshot_cache_misses_total
• grafana_screenshot_duration_seconds
• grafana_screenshot_failures_total
• grafana_screenshot_successes_total
• grafana_screenshot_upload_failures_total
• grafana_screenshot_upload_successes_total