release 0.4.0 (#501)

Signed-off-by: Krasi Georgiev <kgeorgie@redhat.com>
prometheus-junkyard · Jan 18, 2019 · 10ba228 · 10ba228
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diff --git a/CHANGELOG.md b/CHANGELOG.md
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 ## master / unreleased
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+## 0.4.0
  - [CHANGE] New `WALSegmentSize` option to override the `DefaultOptions.WALSegmentSize`. Added to allow using smaller wal files. For example using tmpfs on a RPI to minimise the SD card wear out from the constant WAL writes. As part of this change the `DefaultOptions.WALSegmentSize` constant was also exposed.
  - [CHANGE] Empty blocks are not written during compaction [#374](https://github.com/prometheus/tsdb/pull/374)
  - [FEATURE]  Size base retention through `Options.MaxBytes`.  As part of this change: