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Add COALESCE with -1, to pg_stat_archiver query#1218

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aa-popkov wants to merge 1 commit intoprometheus-community:masterfrom
aa-popkov:fix/pg_stat_archiver-null-value
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Add COALESCE with -1, to pg_stat_archiver query#1218
aa-popkov wants to merge 1 commit intoprometheus-community:masterfrom
aa-popkov:fix/pg_stat_archiver-null-value

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If coalesce is missing, null may be returned, and then NaN is returned to the prometheus metric. This is incorrect for the gauge type.

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