{"action":"created","comment":{"url":"https://api.github.com/repos/prometheus/prometheus/pulls/comments/25073096","id":25073096,"diff_hunk":"@@ -498,6 +499,43 @@ func derivImpl(timestamp clientmodel.Timestamp, args []Node) interface{} {\n \treturn resultVector\n }\n \n+// === histogram_quantile(k ScalarNode, vector VectorNode) Vector ===","path":"rules/ast/functions.go","position":12,"original_position":12,"commit_id":"2f70d11fad3229393ef6b50f3096d51059558b68","original_commit_id":"2f70d11fad3229393ef6b50f3096d51059558b68","user":{"login":"beorn7","id":5609886,"avatar_url":"https://avatars.githubusercontent.com/u/5609886?v=3","gravatar_id":"","url":"https://api.github.com/users/beorn7","html_url":"https://github.com/beorn7","followers_url":"https://api.github.com/users/beorn7/followers","following_url":"https://api.github.com/users/beorn7/following{/other_user}","gists_url":"https://api.github.com/users/beorn7/gists{/gist_id}","starred_url":"https://api.github.com/users/beorn7/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/beorn7/subscriptions","organizations_url":"https://api.github.com/users/beorn7/orgs","repos_url":"https://api.github.com/users/beorn7/repos","events_url":"https://api.github.com/users/beorn7/events{/privacy}","received_events_url":"https://api.github.com/users/beorn7/received_events","type":"User","site_admin":false},"body":"I find that confusing and inconsistent. If histogram_quantile is to be implemented as an aggregator (with the additional gotcha that it always swallows the `le` label), it should work as every other aggregator:\r\n\r\n`sum(v) by (instance)` yields the sum for each instance.\r\n\r\n`sum(v)` yields the sum of everything.\r\n\r\n`histogram_quantile(.9,  rate(histo[5m])) by (instance)` yields the 0.9-quantile for each instance.\r\n\r\n`histogram_quantile(.9,  rate(histo[5m]))` yields the 0.9-quantile for everything.","created_at":"2015-02-20T14:41:12Z","updated_at":"2015-02-20T14:41:12Z","html_url":"https://github.com/prometheus/prometheus/pull/545#discussion_r25073096","pull_request_url":"https://api.github.com/repos/prometheus/prometheus/pulls/545","_links":{"self":{"href":"https://api.github.com/repos/prometheus/prometheus/pulls/comments/25073096"},"html":{"href":"https://github.com/prometheus/prometheus/pull/545#discussion_r25073096"},"pull_request":{"href":"https://api.github.com/repos/prometheus/prometheus/pulls/545"}}},"pull_request":{"url":"https://api.github.com/repos/prometheus/prometheus/pulls/545","id":29638463,"html_url":"https://github.com/prometheus/prometheus/pull/545","diff_url":"https://github.com/prometheus/prometheus/pull/545.diff","patch_url":"https://github.com/prometheus/prometheus/pull/545.patch","issue_url":"https://api.github.com/repos/prometheus/prometheus/issues/545","number":545,"state":"open","locked":false,"title":"Add the histogram_quantile function.","user":{"login":"beorn7","id":5609886,"avatar_url":"https://avatars.githubusercontent.com/u/5609886?v=3","gravatar_id":"","url":"https://api.github.com/users/beorn7","html_url":"https://github.com/beorn7","followers_url":"https://api.github.com/users/beorn7/followers","following_url":"https://api.github.com/users/beorn7/following{/other_user}","gists_url":"https://api.github.com/users/beorn7/gists{/gist_id}","starred_url":"https://api.github.com/users/beorn7/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/beorn7/subscriptions","organizations_url":"https://api.github.com/users/beorn7/orgs","repos_url":"https://api.github.com/users/beorn7/repos","events_url":"https://api.github.com/users/beorn7/events{/privacy}","received_events_url":"https://api.github.com/users/beorn7/received_events","type":"User","site_admin":false},"body":"WIP! Untested, just a preview. Perhaps you want to check if this is sane before I add the expression tests... :)\r\n\r\n@juliusv @brian-brazil 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