Add input plugin for rollbar service. (#1247)

* Report rollbar events.

Signed-off-by: Cyril Duez <cyril@stormz.me>
Signed-off-by: François de Metz <francois@stormz.me>

* Fix indent with go fmt.

* Add test for rollbar webhooks.

* Report more data from new_item event.

* Handle new deploy webhook.

Signed-off-by: Cyril Duez <cyril@stormz.me>
Signed-off-by: François de Metz <francois@stormz.me>

* Update default port.

* Add readme.

* Add rollbar_webhooks to the readme.

* Add rollbar_webhooks to plugins list.

* Add tag level for new_item event.

* Update readme.

* Update changelog.

plugins/inputs/rollbar_webhooks/rollbar_webhooks_events.go

@@ -0,0 +1,78 @@
+package rollbar_webhooks
+
+import "strconv"
+
+type Event interface {
+	Tags() map[string]string
+	Fields() map[string]interface{}
+}
+
+type DummyEvent struct {
+	EventName string `json:"event_name"`
+}
+
+type NewItemDataItemLastOccurence struct {
+	Language string `json:"language"`
+	Level    string `json:"level"`
+}
+
+type NewItemDataItem struct {
+	Id            int                          `json:"id"`
+	Environment   string                       `json:"environment"`
+	ProjectId     int                          `json:"project_id"`
+	LastOccurence NewItemDataItemLastOccurence `json:"last_occurrence"`
+}
+
+type NewItemData struct {
+	Item NewItemDataItem `json:"item"`
+}
+
+type NewItem struct {
+	EventName string      `json:"event_name"`
+	Data      NewItemData `json:"data"`
+}
+
+func (ni *NewItem) Tags() map[string]string {
+	return map[string]string{
+		"event":       ni.EventName,
+		"environment": ni.Data.Item.Environment,
+		"project_id":  strconv.Itoa(ni.Data.Item.ProjectId),
+		"language":    ni.Data.Item.LastOccurence.Language,
+		"level":       ni.Data.Item.LastOccurence.Level,
+	}
+}
+
+func (ni *NewItem) Fields() map[string]interface{} {
+	return map[string]interface{}{
+		"id": ni.Data.Item.Id,
+	}
+}
+
+type DeployDataDeploy struct {
+	Id          int    `json:"id"`
+	Environment string `json:"environment"`
+	ProjectId   int    `json:"project_id"`
+}
+
+type DeployData struct {
+	Deploy DeployDataDeploy `json:"deploy"`
+}
+
+type Deploy struct {
+	EventName string     `json:"event_name"`
+	Data      DeployData `json:"data"`
+}
+
+func (ni *Deploy) Tags() map[string]string {
+	return map[string]string{
+		"event":       ni.EventName,
+		"environment": ni.Data.Deploy.Environment,
+		"project_id":  strconv.Itoa(ni.Data.Deploy.ProjectId),
+	}
+}
+
+func (ni *Deploy) Fields() map[string]interface{} {
+	return map[string]interface{}{
+		"id": ni.Data.Deploy.Id,
+	}
+}