An Annotation Server for PromDash (the Prometheus Dashboard Builder)

go build
./prom_annotation_server <flags>

Once the annotation server is up and running you can add annotations by making HTTP PUT requests to the configured endpoint (default: :9119/annotations):

$ curl -XPUT -d '{"message":"build: web server", "tags": ["build"] }'  "localhost:9119/annotations"
{"result":"ok"}
$

This will add a tag with the current timestamp to all tags listed in tags.
You can also provide the timestamp:

curl -XPUT -d '{"created_at": 1430797123000, "message":"build: web server", "tags": ["build"] }'  "localhost:9119/annotations"

and add an annotation for multiple tags:

curl -XPUT -d '{"created_at": 1430797123000, "message":"build: web server", "tags": ["build-prod", "build-dev"] }'  "localhost:9119/annotations"

To make PromDash pick up annotations, you need to set the ANNOTATIONS_URL to e.g. http://localhost:9119/annotations before starting promdash. See the official docs here for more detailed information.

You can also query the annotation server yourself:

$ curl 'localhost:9119/annotations?tags\[\]=build'
{"posts":[{"created_at":1430797123000,"message":"build: web server"},{"created_at":1430797150000,"message":"build: web server"}]}

By default, the annotation server will show tags for the last 3600 seconds from now on but you can also override the filters by providing the until (absolute timestamp) and r (for range) parameters, both in seconds.

Right now, the annotation server supports local storage on disk (using BoltDB for the storage engine) and (RethinkDB)[http://rethinkdb.com/] (with more to come!)

By default, the annotation server will use the local option with /tmp/annotations.db the default location to store annotations but by using the --storage parameter you can provide different options.

Local example: ./prom_annotation_server --storage=local:/data/prometheus/annotations.db

RethinkDB example: ./prom_annotation_server --storage=rethinkdb:localhost:28015/annotations where localhost:28015 is the host name to connect to and annotations after the slash is the name of ht eB to use. If the DB doesn't exist it's created along with the table annotations that holds the annotations.

Adding a new storage provider is easy. I you're interested in adding a new storage engine then have a look at storage_boltdb.go or storage_rethinkdb.go to see what's needed, it's very straight forward.

• some sort of tag management endpoint would be nice to support deleting of tags
• more storage providers
• ...