NMS-19712: Strafeping overlay fix#29
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marshallmassengill merged 4 commits intoOpenNMS:masterfrom Apr 20, 2026
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rrdtool conventionally uses 8-digit hex with a 00 alpha channel (e.g. #00000000) to declare a fully transparent color on AREA/LINE/STACK commands. Previously _getColor returned the literal 8-digit string, which reached the renderer as an opaque-ish fill in browsers that don't honor CSS 8-digit hex, and left the "no-color" path unused. Treat any 8-digit hex ending in 00 as undefined so the renderer's existing no-color handling (no fill, no auto-palette line) takes over. Colorless commands (e.g. `AREA:meL0`) already produced undefined and are unchanged. Opaque 8-digit hex (alpha != 00) still passes through as-is for browsers that support RGBA hex.
Adds support for StrafePing-style overlays — transparent AREA + colored STACK pairs that rrdtool uses to paint the median line in a loss-colored segment — and handles both the original OpenNMS strafeping definition and the updated one that uses alpha-transparent hex and diff-stacked gray smoke bands. * New `step` option. When enabled, lines and areas render with rrdgraph-style stair-stepping. Stack-type series always render smooth regardless, because Flot's step-mode stacked fills leave triangular gaps between adjacent layers (top/bottom step transitions don't align across stacks). * _mergeOverlaySegments post-processor. Detects transparent-AREA + colored-labeled-STACK pairs (6+ required, colored STACK must carry a legend) and rewrites them as contiguous per-color line segments. Each individual overlay series is mostly NaN (valid only inside its loss range), which Flot renders as isolated dots; the merge joins them into a single colored line across the timeline. Original pairs are hidden but retained in flotSeries so the data table still aligns. * Transparent series (color undefined) now also suppress the line, not just the fill. Flot otherwise auto-assigns a palette color and paints a visible line along the series' data. Verified against every graph definition in graph-defs/: the overlay merge only triggers on strafeping (no other definition has the required transparent-AREA + labeled-STACK pattern at that count), and the only colorless AREA/LINE/STACK commands in the tree are the strafeping overlay bases.
* Guard the overlay merge against mismatched series lengths: step 2 reads stackSeries.data[j] for every j in [0, numValues). Every series built in drawChart has exactly numValues points, but if a caller ever hands us mismatched lengths we now bail out instead of reading OOB. * Rename `seriesSteps` to `useStepRendering` — it's a per-series step-rendering flag, not a Flot config named `steps`. * Document the behavior change introduced when colorless series started suppressing their line: `LINE:foo` without a color used to render in Flot's auto-assigned palette color and now renders as nothing. No shipped OpenNMS graph definition uses that form; the comment captures the rationale for future readers who hit a regression. * Clarify the scope of `_getColor`'s normalization: only 8-digit hex with a 00 alpha is treated as transparent. 3-, 4-, and 6-digit values are passed through as-is. * Drop the "6+" magic number from the `_mergeOverlaySegments` docstring. The threshold is already commented where it's enforced; having it in two places invited drift.
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LGTM! just a couple small nits before merging.
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This will address the consecutive data median line drawing issue for NMS-19712. I have tested this against data from several different instances of OpenNMS and I've targeted this specifically around the StrafePing data series. We will need to do a build and release for this to get it into a release of OpenNMS.
This does also technically introduce the ability to create step graphs as well, though that will require additional upstream changes to enable fully and it is disabled by default (just now passed through correctly to enable it as an option).
Screenshot showing before:
Screenshot showing after:
Two additional after shots that are Zoomed in:
Assisted-by: Claude Code:Opus 4.6 & 4.7
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