cloudflare
diff --git a/‎CONTRIBUTING.md
+13 b/‎CONTRIBUTING.md
+13
diff --git a/‎LICENSE
+201 b/‎LICENSE
+201
diff --git a/‎Makefile
+7 b/‎Makefile
+7
diff --git a/‎README.md
+175 b/‎README.md
+175
@@ -0,0 +1,13 @@
+# Contributing to alertmanager2es
+
+Contributions are welcomed.
+
+## Getting started
+
+To download, run:
+
+    go get -u github.com/cloudflare/alertmanager2es
+
+To run the tests:
+
+    make test
@@ -0,0 +1,201 @@
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@@ -0,0 +1,7 @@
+.PHONY: build test
+
+build: test
+	go build -ldflags "-X main.revision=$(git describe --tags --always --dirty='-dev')"
+
+test:
+	go test $(go list ./... | grep -v /vendor/)
@@ -0,0 +1,175 @@
+# alertmanager2es
+
+alertmanager2es receives [HTTP webhook][] notifications from [AlertManager][]
+and inserts them into an [Elasticsearch][] index for searching and analysis. It
+runs as a daemon.
+
+The alerts are stored in Elasticsearch as [alert groups][].
+
+[alert groups]: https://prometheus.io/docs/alerting/alertmanager/#grouping
+[AlertManager]: https://github.com/prometheus/alertmanager
+[Elasticsearch]: https://www.elastic.co/products/elasticsearch
+[HTTP webhook]: https://prometheus.io/docs/alerting/configuration/#webhook-receiver-<webhook_config>
+
+## Rationale
+
+It can be useful to see which alerts fired over a given time period, and
+perform historical analysis of when and where alerts fired. Having this data
+can help:
+
+- tune alerting rules
+- understand the impact of an incident
+- understand which alerts fired during an incident
+
+It might have been possible to configure Alertmanager to send the alert groups
+to Elasticsearch directly, if not for the fact that [Elasticsearch][] [does not
+support unsigned integers][] at the time of writing. Alertmanager uses an
+unsigned integer for the `groupKey` field, which alertmanager2es converts to a
+string.
+
+[does not support unsigned integers]: https://github.com/elastic/elasticsearch/issues/13951
+
+## Limitations
+
+- alertmanager2es will not capture [silenced][] or [inhibited][] alerts; the alert
+  notifications stored in Elasticsearch will closely resemble the notifications
+  received by a human.
+
+[silenced]: https://prometheus.io/docs/alerting/alertmanager/#silences
+[inhibited]: https://prometheus.io/docs/alerting/alertmanager/#inhibition
+
+- Kibana does not display arrays of objects well (the alert groupings use an
+  array), so you may find some irregularities when exploring the alert data in
+  Kibana. We have not found this to be a significant limitation, and it is
+  possible to query alert labels stored within the array.
+
+## Prerequisites
+
+To use alertmanager2es, you'll need:
+
+- an [Elasticsearch][] cluster
+- [Alertmanager][]
+
+To build alertmanager2es, you'll need:
+
+- [Make][]
+- [Go][] 1.7 or above
+- a working [GOPATH][]
+
+[Make]: https://www.gnu.org/software/make/
+[Go]: https://golang.org/dl/
+[GOPATH]: https://golang.org/cmd/go/#hdr-GOPATH_environment_variable
+
+## Building
+
+    go get -u github.com/cloudflare/alertmanager2es
+    make
+
+## Configuration
+
+### alertmanager2es usage
+
+alertmanager2es is configured using commandline flags. It is assumed that
+alertmanager2es has unrestricted access to your Elasticsearch cluster.
+
+alertmanager2es does not perform any user authentication.
+
+Run `./alertmanager2es -help` to view the configurable commandline flags.
+
+### Example Alertmanager configuration
+
+#### Receiver configuration
+
+```yaml
+- name: alertmanager2es
+  webhook_configs:
+    - url: https://alertmanager2es.example.com/webhook
+```
+
+#### Route configuration
+
+By omitting a matcher, this route will match all alerts:
+
+```yaml
+- receiver: alertmanager2es
+  continue: true
+```
+
+### Example Elasticsearch template
+
+Apply this Elasticsearch template before you configure alertmanager2es to start
+sending data:
+
+```json
+{
+  "template": "alertmanager-2*",
+  "settings": {
+    "number_of_shards": 1,
+    "number_of_replicas": 1,
+    "index.refresh_interval": "10s",
+    "index.query.default_field": "groupLabels.alertname"
+  },
+  "mappings": {
+    "_default_": {
+      "_all": {
+        "enabled": false
+      },
+      "properties": {
+        "@timestamp": {
+          "type": "date",
+          "doc_values": true
+        }
+      },
+      "dynamic_templates": [
+        {
+          "string_fields": {
+            "match": "*",
+            "match_mapping_type": "string",
+            "mapping": {
+              "type": "string",
+              "index": "not_analyzed",
+              "ignore_above": 1024,
+              "doc_values": true
+            }
+          }
+        }
+      ]
+    }
+  }
+}
+```
+
+We rotate our index once a month, since there's not enough data to warrant
+daily rotation in our case. Therefore our index name looks like:
+
+    alertmanager-200601
+
+We anchor the template name with `-2` to avoid inadvertently matching other
+indices, e.g.  `alertmanager-foo-200601`. This of course assumes that you will
+no longer care to index your alerts in the year 3000.
+
+## Failure modes
+
+alertmanager2es will return a HTTP 500 (Internal Server Error) if it encounters
+a non-2xx response from Elasticsearch. Therefore if Elasticsearch is down,
+alertmanager2es will respond to Alertmanager with a HTTP 500. No retries are
+made as Alertmanager has its own retry logic.
+
+Both the HTTP server exposed by alertmanager2es and the HTTP client that
+connects to Elasticsearch have read and write timeouts of 10 seconds.
+
+## Metrics
+
+alertmanager2es exposes [Prometheus][] metrics on `/metrics`.
+
+[Prometheus]: https://prometheus.io/
+
+## Example Elasticsearch queries
+
+    alerts.labels.alertname:"Disk_Likely_To_Fill_Next_4_Days"
+
+## Contributions
+
+Pull requests, comments and suggestions are welcome.
+
+Please see [CONTRIBUTING.md](CONTRIBUTING.md) for more information.