Tunes some RRD database file header options

# rrd_tune

(PECL rrd >= 0.9.0)

rrd_tune — Tunes some RRD database file header options

### Description

rrd_tune(string `$filename`, array `$options`): bool

Change some options in the RRD dabase header file. E.g. renames the source for the data etc.

### Parameters

`filename`
  RRD database file name.
`options`
  Options with RRD database file properties which will be changed. See rrd tune man page for details.

### Return Values

Returns `true` on success or `false` on failure.

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